Ocean Reef Neptune Space G-divers User manual

NEPTUNE SPACE G.divers FULL FACE MASK
OWNER’S MANUAL

2
For nearly 60 years, OCEAN REEF has been involved in the underwater diving industry.
We have contributed much to this industry, from fins and snorkels to the most modern
systems of underwater communication. Through the spirit of intrepid pioneers, brilliant
inventors, passionate divers, and dynamic entrepreneurs, OCEAN REEF has been able to
turn dreams into reality in the underwater world.
OCEAN REEF USA OCEAN REEF ITALY
In order to limit our paper consumption, and as a part of our environmental friendly and
responsible approach, OCEAN REEF prefers to put user documentation online rather than
print them out.
Please refer to the following areas of our web site:
Manuals: http://www.gdivers.com/manuals.html
We also provide online video tutorials showing you how to set up your mask and com unit
Video: http://www.gdivers.com/videos.html
© OCEAN REEF 2010

NEPTUNE SPACE G.divers manual rel.1.7 October 2010
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NEPTUNE SPACE G.divers OWNER’S MANUAL
TABLE OF CONTENTS
Premise and warnings 4
Introduction 5
General precautions and warnings 5
What’s the correct mask size? 7
Use of conventional regulators 8
1st stage SL 35TX 8
Equalization 9
Quick steps 10
Purging 12
Serial number 12
Maintenance and cleaning 13
Storage 13
Communication 14
Troubleshooting 15
Schematic and parts list (Neptune Space G.divers) 16
Schematic and parts list (SL 35TX) 18
Warranty 21

4
The DPIs (Individual Protective Device) scrutinized in these operating instructions have
undergone every possible test for design validation by:
Germanisher Lloyd
Vorsetzen 35
20459 Hamburg—Germany
Notified Body n.: 0098
Full face Mask Neptune Space and SL35TX
Comply with CE Certification in accordance with 89/689/EEC directives under the UNI
EN250:2000 standard rules for underwater activities, including cold water use.
PREMISE
The DPIs in question are a separate part of the self-contained underwater breathing
apparatus, commonly known as SCUBA.
They comply with European regulation EN-250:2000. They can be stored at a
temperature of between 32° and 140° F. It is necessary that this equipment only be
used by fully trained, certified divers.
Operating restrictions:The DPIs in question cannot be used with diving products
without the CE mark and the air supply must meet the requirements of EN 12021.
Incorrect use, non-original spare parts and insufficient or poor maintenance, besides
being dangerous to the health and life of the user, releases MESTEL Safety of any
responsibility and nullifies the warranty.
The series of DPIs described in the following manual are the following:
NEPTUNE SPACE G.divers with 1st stage SL 35TX: full face mask with integrated 2nd
stage regulator and SL 35 TX 1st stage.
WARNINGS, CAUTIONS, NOTES
Pay special attention to information provided in warnings, cautions and notes that are
accompanied by these symbols:
A WARNING indicates a procedure or situation that, if not avoided, could
result in serious injury or death to the user.
A CAUTION indicates any situation or technique that could cause damage
to the product, and could subsequently result in injury to the user.
A NOTE is used to emphasize important points, tips, and reminders.

NEPTUNE SPACE G.divers manual rel.1.7 October 2010
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NEPTUNE SPACE G.divers
INTRODUCTION
The NEPTUNE SPACE G.divers mask was developed through experience gained from
producing products for military personnel protection. All designs and materials were
tested to obtain superior performance and increased safety.
The high quality of the product does not allow the user to ignore the problems
connected with the correct use of the product and the rules for safe diving.
GENERAL PRECAUTIONS AND WARNINGS
Before using this mask, you must have successfully received training and
certification in the technique of SCUBA diving from a recognized certification agency
(or any U.S. Military or government operated diving school). Use of this equipment
by a person who is not certified by a recognized agency shall render all warranties,
express or implied, null and void.
Use of SCUBA equipment by uncertified or untrained persons is dangerous and
can result in serious injury or death.
This mask is not configured for commercial use with surface supplied air.
Always pressurize the Neptune Space G.divers gradually by opening the
cylinder valve SLOWLY.
NEVER lubricate any part of the mask and/or regulator or cylinder valve with
any lubricant. Lubrication must only be performed by an OCEAN REEF trained
technician.
DO NOT apply any type of aerosol spray on the Neptune Space G.divers.
Doing so may cause permanent damage to certain plastic components,
including the second stage housing.
DO NOT leave a cylinder standing unsecured with the Neptune Space G.divers
attached to the valve. Doing so may cause permanent damage to the FFM and
cylinder valve if the cylinder falls over against the first stage.
Factory prescribed service for this product must be performed at least once
annually by a factory trained OCEAN REEF Service Technician who is
employed by an Authorized OCEAN REEF Dealer. Repair, service, disassembly,
or first stage adjustment must not be attempted by persons who are not
factory trained and authorized by OCEAN REEF.
When diving in cold water (below 450 F, or 70 C), you must have received
training and certification in the techniques of cold water diving from a
recognized training agency.

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The Neptune SPACE G.divers might be used with NITROX gasses up to
40% O2. It is always recommended to use cleaned air from specified
cleaned air source. SL35TX 1st stage can’t be used with NITROX. Always
use NITROX compatible 1st stages when NITROX is required.
Note: not valid in the European Union.
European Union NITROX standards indicate that regulators using gases
over 22% must be purchased together with first stages. They must have
special markings indicating that they are O2 clean.
Before connecting the regulator to the tank, check the following:
•Check that the O-ring on the tank is in place on the valve and is in
perfect working condition (INT WITH Yoke nipple CGA 850 version
only). If it is damaged or missing, it should be replaced.
•Verify that the instrumentation and accessories have been installed
correctly.

NEPTUNE SPACE G.divers manual rel.1.7 October 2010
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WHAT’S THE CORRECT MASK SIZE?
The Neptune Space G.divers is available in two sizes, Small/Medium and Medium/Large.
In order to determine whether a diver should wear a S/M or M/L mask, OCEAN REEF has
designed a Mask Measuring Kit. The sizing and measuring system were designed in
accordance with the official measuring procedure used in the Los Alamos Scientific
Laboratory Charts at the SBCCOM Mask Fit Facility-Aberdeen Proving Ground (Maryland,
USA).
Before purchasing a mask, the customer may use the calliper to take two simple face
measurements. Using the Full Face Mask Size Recommendation Chart, he or she can
evaluate the size category into which the measurements fall. There are three different
size categories on the chart: Small/Medium, Both, & Medium/Large. If the
measurements fall within the both category, then the diver should technically be able to
wear either full face mask (M/L or S/M), and in that case should try on a mask to select
the best fit. Please note that the chart boundaries fade. The fading areas represent less
common face measurements. It is very likely that a mask will still fit comfortably even if
measurements are located in these fading areas.

8
USE OF CONVENTIONAL REGULATORS
A special adapter allows the connection of several kinds
of regulators. The adaptor is available in two sizes,
medium (standard) and small. This adapter fits in place
of the surface air valve (code 33020: S, code 33021: M).
USE OF OVER-INJECTED REGULATORS
Over injected regulators have a diaphragm with an
inhalation cracking pressure below zero. These
regulators “free flow” easily, and as a result, should not
be used with the Neptune Space G.divers or other
Neptune masks.
Changes in regulator performance can also be caused by
the different positions assumed during a dive; the use of
a regulator with flow adjustment is recommended.
When descending the adjustment knob must always be turned on to get
the proper air flow. Do not turn off the adjustment knob while
descending.
1ST STAGE SL 35 TX
The Neptune Space G.divers may be used only with this high performance, balanced
diaphragm 1st stage with anti-freeze kit. The first stage has adjustable medium pressure
and is made of brass with a satin finish body, stainless steel piston, Teflon seat, and
stainless steel spring.
It is available with the following characteristics:
•Standard connection 200 bar (code 9922)
•DIN connection 300 bar (code 9923)
•2 high pressure ports 7/16 -20 UNF
•4 Medium pressure ports 3/8-24 UNF
•Flow rate of approx. 4800 l/m at 140 bars

NEPTUNE SPACE G.divers manual rel.1.7 October 2010
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EQUALIZATION
The Neptune Space G.divers is equipped with a simple patented internal device to close
the nostrils and allow underwater equalization. By loosening the screw it is possible to
move the plate up and down to find the most comfortable position to equalize. The
silicone caps may easily be turned. By turning the caps you may adjust them to fit a
larger or thinner nose (distance between the nostrils). Two additional plastic inserts are
supplied. By removing the silicone cap it is possible to install the insert in the plate (cap
post) increasing the distance of the cap from the plate and allowing it to fit closer to
the nostril. This is sometimes necessary for flatter noses or when a hood is used under
the mask.
To close the nostrils for equalization, simply press the top part of the mask (or push on
the regulator front cover especially if using the visor light). The two equalization
silicone caps will move upward and close the nostrils.
The silicone caps when correctly positioned should allow breathing through the nose and
close the nostrils only when pressing the top part of the mask to equalize
Equalization extensions with their storage support.

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QUICK STEPS
BEFORE DIVING
1. Adjust the equalization system to fit perfectly your need and test it on your face
until you feel completely comfortable.
2. Don the mask (make sure surface air valve or octopus port is open to allow air in
if installed).
3. Completely pull down the central part of the strap and adjust the 6 straps, middle
ones first, than bottom ones and finally the top ones.

NEPTUNE SPACE G.divers manual rel.1.7 October 2010
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4. With the LP hose plugged in press the purge button of the 2nd stage and check
that the air flows freely. Release the button and check that air stops flowing.
5. Close surface air valve before descending (if installed).
DURING A DIVE
1. Breathe normally through your nose or mouth, whichever is most comfortable.
2.
3. To equalize, press the front part of the regulator or the top of the mask(without
pushing the purge button).
For more information watch the tutorial videos on www.gdivers.com

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AFTER DIVING
1. Carefully rinse the regulator with fresh, gently flowing water. Do not press the
purge button.
2. Make sure the dust cover is firmly in place to keep water out of the first stage.
3. Attach the regulator to the tank after rinsing and press the purge button for 10-15
seconds to purge any water or debris from regulator.
4. When storing equipment, do not tightly loop the hoses and avoid pulling on them
when the regulator is attached to the tank. Do not bump the Neptune Space
G.divers. If you do, check for any damage.
5. When storing the mask, turn the adjustment knob counterclockwise.
OCEAN REEF highly recommends that you practice in a pool before using your mask
in open water.
PURGING
The mask can easily be purged in the event that water enters the mask by pressing the
exhaust button on the second stage. The water will flow out of the lower valve. The
diver should be facing straight ahead, with the exhaust valve being the LOWEST part of
the system.
SERIAL NUMBER
The regulator housing is marked with a serial number that identifies the product for
warranty purposes.

NEPTUNE SPACE G.divers manual rel.1.7 October 2010
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MAINTENANCE AND CLEANING
TYPE OF ACTION
BEFORE A
DIVE
AFTER A
DIVE
EVERY
YEAR
EVERY 2
YEARS
RINSE
X
GENERAL FUNCTION CHECK
X
REGULATOR SERVICING
X
MASK SERVICING
X
For optimum longevity of the mask and the proper functioning of its parts we
recommend rinsing the mask thoroughly in fresh water after every use. DO NOT
clean the visor with any abrasive materials. We recommend drying the visor,
especially the inside parts, with a soft, clean cloth.
STORAGE
The mask must be stored in a dry place with no direct sunlight and far from sources of
heat. Do not store it at temperatures below -4°F (-20°C) or above +122°F (+50°C). We
suggest you use the AC-4 visor protector and the carrying bag included in the package
when storing the mask to avoid accidental abrasion (see section 2.4.3).

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COMMUNICATION
COMMUNICATION APPARATUS
The Neptune Space G.divers may be used with various communication systems between
divers and/or the surface. It is compatible with most underwater communication
systems if supplied with the proper adapter and/or DIN connection. Information may be
obtained from your OCEAN REEF dealer.
INSTALLING THE UNDERWATER COMMUNICATION SYSTEM
The microphone support (PTT) is screwed into the connection located on the left side of
the mask and identified with the words COMMUNICATION SYSTEM. The GSM G.divers is
installed on the left side of the head harness attaching the Neptune Assembly
Connection System (NACS) on the 2 visor supports as per NACS/GSM G.divers
instructions.
For more information watch the tutorial videos on www.gdivers.com
USE OF THE UNDERWATER COMMUNICATION SYSTEM
For correct use of the underwater communication system read the specific manual.

NEPTUNE SPACE G.divers manual rel.1.7 October 2010
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TROUBLESHOOTING
VISOR FOGS
Warning: Fogging is a Signal That Mask Is Not Positioned Correctly On Face!
a) orinasal mask positioned incorrectly or pinched.
b) orinasal mask improperly seated—check that it is properly tucked around
communication port and exhaust valve.
c) Top harness straps pulled too tightly—loosen.
d) Bottom harness straps not pulled tight enough.
AIR LEAKS
a) Hair/hood trapped inside mask skirt.
b) Sewing on hood—skirt will not necessarily seal on all hoods, especially if sewing on
hood is where mask skirt fits.
c) Straps pulled too tightly or improperly.
REGULATOR FREE-FLOWS
a) Adjustment knob opened too much—regulate by closing knob in face-down
position.
b) Purge button has sand/pebbles stuck inside.
c) Regulator needs servicing *.
d) 1st stage intermediate pressure not 140±3 psi / 9.5→9.8 bar.
REGULATOR HARD TO BREATHE THROUGH
a) Adjustment knob closed too much—regulate by opening knob in face-down
position.
b) Regulator needs servicing *.
c) 1st stage intermediate pressure not 140±3 psi / 9.5→9.8 bar.
FFM VIBRATES
a) Harness straps not adjusted properly—tighten bottom straps.
b) Adjustment knob opened too much.
c) Neptune Space adjustment too soft—make proper adjustment with adjustment
tool *.
d) 1st stage intermediate pressure not 140±3 psi / 9.5→9.8 bar.
* OCEAN REEF recommends that the regulator be serviced at least once a year, or
after 100 dives. This should only be performed by an OCEAN REEF dealer or an
authorized OCEAN REEF repair station which uses original spare parts. This also
applies to any periodic serving and/or repairs required.

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NEPTUNE SPACE G.divers manual rel.1.7 October 2010
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7015 1 Visor - Space 16 8448 1 Regulator housing - Space w/SN 15
6529 4 NG-24 M3 nut 6
1352 1 FACE SEAL COBALT M/L
7
9420 1 O-RING 114
31
1359 1 FACE SEAL EMERALD M/L 7 9672 1 NOZZLE 30
new 1 FACE SEAL white M/L 7 9673 1 O-RING 2025 29
new 1 FACE SEAL Pink M/L 7 15257 1 BODY WASHER 24
1360 1 FACE SEAL EMERALD S/M
7
15433 1 HEX NUT
23
1353 1 FACE SEAL COBALT S/M 7 15446 1 O-RING 2068 27
new 1 FACE SEAL white S/M 7 15447 1 WEDGE 34
new 1 FACE SEAL Pink S/M 7 15448 1 DEMAND LEVER 33
6810 2 Quick release 4 15532 1 IIND STAGE BODY HOUSING 32
9003 1 M-8 STRAP FOR FRB/2 BUCKLE
1
15750 1 TRIM SCREW
44
9002 6 FRB/2 BUCKLE 2 16456 1 Adjustment screw 43
6528 1 NG/23 SCREW M3 X 14 5 15470 1 balanced poppet chamber 41
6801 1 Clamping Band 3 6966 1 Spring L33-D thread 0,9 D int 8,4 39
6781 1 Inhalation Diaphragm w/puck rel 7 17 15439 1 O-ring balanced poppet 2.6 x 1 37
20080 1 Silicone button w/ NS logo emerald
18
9675
1
balanced poppet
36
OR003102 1 Silicone button w/ NS logo white
18
8866
1
Seat balance poppet
35
OR003103 1 Silicone button w/ NS logo pink 18 OR003090 1 dive/predive x g-divers 28
OR003101 1 Silicone button w/ NS logo cobalt 18 6963 1 o-ring * dive predive 24 *2 27
OR003092 1 g-divers front cover black w/logo
19
6964
1
insert OR 2075
25
6961 2 Screw long - front cover Space 21 6980 1 spring I 8,5 D thread 0,9 int 5,5 40
6962 1 Screw short - front cover Space 20 6970 1 Insert 26
6965 7 O-ring 2010 22 OR003068 1 Adjustment knob white 46
6924 2 SB-5C ECCENTRIC EQUALIZER BLOCK 11 OR003069 1 Adjustment knob pink 46
6925 1 SB-5A EQUALIZER
14
OR003066
1
Adjustment knob cobalt
46
15253 1 WASHER M4 FOR SCREW M4x8
13
OR003067
1
Adjustment knob emerald
46
15255 1 SCREW M4x8 12 6518 1 NG/15 BUSHING W/HOLES 65
15258 1 INSERT M4 CO5 6710 1 MI/10 O-RING 2131 33 X 1,78 64
6926 2 EQUALIZER EXTENTION SHORT 3mm
8811 2 ER-09 EXHALATION VALVE
62
6927 2 EQUALIZER EXTENTION LONG 6mm OR003089 1 G-DIVER VALVE HOLDER 63
6928 2 EQUALIZER EXTENTION X-LONG 10mm 6520 1 exhaust valve cover 60
1367 1 N/7 ORINASAL CRYSTAL 8 OR003088 1 OR oval sticker
1377 2 orinasal valve holder 66 OR003054 1 exhaust/SAV ring cobalt 67
1376 2 orinasal valve
9
OR003055 1 exhaust/SAV ring emerald
67
6718 1 MI/14 ORINASAL BAND 10 OR003056 1 exhaust/SAV ring white 67
6514 1 NG/10 SIDE CONNECTOR BUSHING 55 OR003057 1 exhaust/SAV ring pink 67
OR003049 1 NG-9 SAV/OCTOPUS 53
1361 2 NG/13 SEAL 58
6515 2 NG/9B PLUG 59
6501 2 NG/12 O-RING 46,9 X 1,5
54
6304 1 NG-9 SIDE CONNECTOR wo/ h 57
6549 1 M/P2 COM. SYSTEM BUSHING rel 7.1 56
OR003052 2 side ports silicone ring white 68
OR003053 2 side ports silicone ring pink
68
OR003050 2 side ports silicone ring cobalt 68
OR003051 2 side ports silicone ring emerald 68

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NEPTUNE SPACE G.divers manual rel.1.7 October 2010
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SL 35 TX (1ST STAGE) 4.0
Key
Code
R-DIN
R-YOKE
Designation
1
9810
1
1
Retaining cap
2
9811
1
1
Diaphragm Ø33 x 1.5
3
9812
1
1
Pressure piston
4
9813
1
1
Intermediate ring
5
9814
1
1
Anti freeze kit
6
9815
1
1
Adjusting screw
7
9816
1
1
Spring
8
9817
1
1
Spring Plate
9
9818
1
1
Friction Ring
10
9819
1
1
Diaphragm Ø36.9 x 2
11
9820
1
1
Piston guide
12
9821
1
1
Regulator body
13
9822 3
3
LP plug, 3/8 UNF
14
9823 4
4
O-ring 7,65 x 1,78
15
9824
1
1
Piston
16
98251
1
Guide ring
17
9826
1
1
Spring
18
9827
1
1
Retaining cap
19
9620
1
1
O-ring 2,9 x 1,78(2012)
20 9829 11Back pressure ring 3,2 x1,5
21
9411
1
1
O-ring 14,00 x 1,78(2056)
22
9831
1
1
Balancing chamber
23
9832
2
2
O-ring 8,73 x 1,78
24
9833
2
2
HP plug, 7/16 UNF
25
9834
1
Yoke INT, 9/16-18 UNF
26
9835
1
Yoke screw, 9/16-18 UNF
27
7831
1
2
O-ring 9,25 x 1,78 (2037)
28
9837 1
Yoke fastener
29
9838
1
Filter element YOKE
30
9839 1
Retaining ring
31 9840 1Hand wheel fastener, 300 bar
32
9841
1
Filter element DIN
33
9842
1
Hand wheel DIN, 300 bar
34
9843
1
O-ring 10,82 x 1,78
35 9844 1Retaining screw DIN, 300 bar
36
9845
1
O-ring 11,00 x 2,5
37
9846
Conversion kit, YOKE
38 9847 Conversion kit DIN, 300 bar

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Warranty
1. OCEAN REEF masks are guaranteed to be free of material or manufacturing
defects for a period of 24 months from the time the unit is purchased. For the
duration of the guarantee, the Company’s responsibility is limited to replacement
of any parts that are defective in our opinion, and that have not been used
incorrectly or handled negligently. The mask must be returned to the outlet from
which it was bought, along with the warranty card. The cost of transport is to be
prepaid by the customer.
2. Even during the guarantee period, this guarantee shall not be valid where:
oDamage was caused by incorrect handling or carelessness.
oDamage was caused by the mask falling after it was purchased.
oDamage caused by fire, earthquake, floods, lightning, or other natural
disasters.
oThe warranty card is not produced.
oOur name, the date of purchase, and the seller’s name do not appear on
the warranty card.