Ocean Reef NEPTUNE SPACE PREDATOR User manual

NEPTUNE SPACE PREDATOR FULL FACE MASK
OWNER’S MANUAL

NEPTUNE SPACE PREDATOR Owner’s Manual rel. 3.4 3
#UNDERWATERNATURALLY
For nearly 70 years, OCEAN REEF has been involved in the underwater diving industry. We have
contributed much to this industry, from ns 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.
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 our web site:
diving.oceanreefgroup.com/support/
OCEAN REEF USA MESTEL Safety ITALY
© OCEAN REEF 2020

NEPTUNE SPACE PREDATOR Owner’s Manual rel. 3.44
NEPTUNE SPACE OWNER’S MANUAL
WARNING, CAUTION, NOTES
INTRODUCTION
GENERAL PRECAUTIONS AND WARNINGS
WHAT’S THE CORRECT SIZE
USE OF CONVENTIONAL REGULATOR
1ST STAGE SL 35TX
AIR CIRCULATION
EQUALIZATION
QUICK STEPS
PURGING
SERIAL NUMBER
MAINTENACE AND CLEANING/STORAGE
COMMUNICATION
TROUBLESHOOTING
Schematic and parts list (Neptune Space Predator)
Schematic and parts list (SL 35TX)
Warranty
5
6
6
8
9
9
10
10
11
13
14
14
15
16
18
20
22
TABLE OF CONTENTS

NEPTUNE SPACE PREDATOR Owner’s Manual rel. 3.4 5
#UNDERWATERNATURALLY
The PPE (Personal Protective Equipment) described in these operating instructions have undergone
every possible test for design validation by:
Germanisher Lloyd
Vorsetzen 35
20459 Hamburg—Germany
Notied Body n.: 0098
Full face Mask Neptune Space and SL35TX
comply with CE Certication in accordance with Regulation (EU) 2016/425 under the UNI EN250:2000
standard rules for underwater activities, including cold water use.
PREMISE
The PPEs in question are a separate part of the self-contained underwater breathing apparatus,
commonly known as SCUBA.
They comply to 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, certied divers.
Operating restrictions: The PPE in question cannot be used with diving products without the CE mark
and the air supply must meet the requirements of EN 12021 for breathing air. Incorrect use, non-original
spare parts and insufcient or poor maintenance, besides being dangerous to the health and life of the
user, releases MESTEL Safety of any responsibility and nullies the warranty.
The series of PPEs described in the following manual are the following:
NEPTUNE SPACE 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 is 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 PREDATOR Owner’s Manual rel. 3.46
The Neptune Space PREDATOR 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 front cover of the mask’s state-of-the-art integrated
regulator is made of laser-cut ANTICORODAL®. This part has a
light gold nish which recalls the helmets of the rst deep water
divers. The adjustment knob and its internal trim screw are made
by stainless steel AISI 316 to provide the maximum strength.
A stainless steel AISI 316 frame and six stainless steel fast-release
buckles not only give the mask a sturdy feeling, but also provide
an unbreakable framework. Each part is laser-cut and hand
nished.
GENERAL PRECAUTIONS AND WARNINGS
Before using this mask, you must have successfully received training and certication in the
technique of SCUBA diving from a recognized certication agency (or any U.S. Military or government
operated diving school). Use of this equipment by a person who is not certied by a recognized
agency shall render all warranties, express or implied, null and void.
GUse of SCUBA equipment by uncertied or untrained persons is dangerous and can
result in serious injury or death.
This mask is not congured for commercial use with surface supplied air.
Always pressurize the Neptune Space RAPTOR gradually by opening the cylinder
valve SLOWLY.
NEVER lubricate any part of the Neptune Space PREDATOR 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. Doing so may cause
permanent damage to certain plastic components, including the second stage
housing.
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.
NEPTUNE SPACE
INTRODUCTION
The Space PREDATOR mask is Nitrox compatible up to 40% of oxigen. (NOT valid in the European
Countries)

NEPTUNE SPACE PREDATOR Owner’s Manual rel. 3.4 7
#UNDERWATERNATURALLY
DO NOT leave a cylinder standing unsecured with the Neptune Space PREDATOR
attached to the valve. Doing so may cause permanent damage to the Neptune
Space and cylinder valve if the cylinder falls over against the rst 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 rst stage
adjustment must not be attempted by persons who are not factory trained and
authorized by OCEAN REEF.
Neptune Space PREDATOR is not CE certied to be used with NITROX!
The Neptune SPACE might be used with NITROX gasses up to 40% O2. It is
always recommended to use cleaned air from specied 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.
When diving in cold water (below 450 F, or 70 C), you must have received training
and certication in the techniques of cold water diving from a recognized training
agency.
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 PREDATOR Owner’s Manual rel. 3.48
WHAT’S THE CORRECT MASK SIZE?
The Neptune Space 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 ofcial measuring
procedure used in the Los Alamos Scientic 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 t. Please note that the chart boundaries fade. The fading areas represent less common
face measurements. It is very likely that a mask will still t comfortably even if measurements are
located in these fading areas.
1ST STAGE SL 35 TX

NEPTUNE SPACE PREDATOR Owner’s Manual rel. 3.4 9
#UNDERWATERNATURALLY
A special adapter allows the connection of several kinds of
regulators. The adaptor is available in two sizes, medium
(standard) and small. This adapter ts 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 ow”
easily, and as a result, should not be used with the Neptune Space
PREDATOR 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 ow adjustment is recommended.
The Neptune Space may be used with this high performance, balanced diaphragm 1st stage with anti-
freeze kit. The rst stage has adjustable medium pressure and is made of brass with a satin nish
body, stainless steel piston, Teon 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
When descending the adjustment knob must always be turned on to get the proper
air ow. Do not turn off the adjustment knob while descending.
USE OF CONVENTIONAL REGULATORS
1ST STAGE SL 35 TX

NEPTUNE SPACE PREDATOR Owner’s Manual rel. 3.410
The Neptune Space air circulation system is designed to minimize fogging and reduce the amount of
CO and CO2 build-up. The silicone oral-nasal pocket is built with two one-way valves through which air
is inhaled.
Position D, the “off” position is used when the diver is in a “head-down” position which, due to pressure
on the second stage, causes the regulator to free ow. Placing the exhaust valve in the off position
causes pressure to build in the mask, preventing free ow and returning the system to an “air on
demand” situation.
The Neptune Space 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 nd the
most comfortable position to equalize. The silicone caps may easily be turned. By turning the caps you
may adjust them to t 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 t closer to the nostril. This is
sometimes necessary for atter 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.
Exhaled air is directed through a valve under the oral-nasal pocket, limiting the mixing of this air
(containing high amounts of CO2) with the fresh air from the regulator. The direction of exhaled air
is controlled by a four position exhaust valve. The adjustable valve allows exhaust to ow in four
directions:
A—to the left
B—to the right
C—both (direction of least resistance)
D—no exhaust
AIR CIRCULATION
EQUALIZATION

NEPTUNE SPACE PREDATOR Owner’s Manual rel. 3.4 11
#UNDERWATERNATURALLY
QUICK STEPS
BEFORE DIVING
1. Adjust the equalization system to t 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

NEPTUNE SPACE PREDATOR Owner’s Manual rel. 3.412
DURING A DIVE
1. Breathe normally through your nose or mouth, whichever is most comfortable.
rst, than bottom ones and nally the top ones.
4. With the LP hose plugged in press the purge button of the 2nd stage and check that the
air ows freely. Release the button and check that air stops owing.
5. Close surface air valve before descending (if installed).
2. 2. 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.oceanreefgroup.com

NEPTUNE SPACE PREDATOR Owner’s Manual rel. 3.4 13
#UNDERWATERNATURALLY
AFTER DIVING
1. Carefully rinse the regulator with fresh, gently owing water. Do not press the purge button.
2. Make sure the dust cover is rmly in place to keep water out of the rst 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. 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 ow 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 identies the product for warranty purposes.

NEPTUNE SPACE PREDATOR Owner’s Manual rel. 3.414
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).
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.
TYPE OF ACTION BEFORE A DIVE AFTER A DIVE EVERY YEAR EVERY 2 YEAR
RINSE X
GENERAL
FUNCTION CHECK X
REGULATOR
SERVICING X
MASK SERVICING X
AFTER DIVING

NEPTUNE SPACE PREDATOR Owner’s Manual rel. 3.4 15
#UNDERWATERNATURALLY
COMMUNICATION
COMMUNICATION APPARATUS
The Neptune Space PREDATOR 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.
The microphone support (PTT) is screwed into the connection located on the left side of the mask and
identied with the words COMMUNICATION SYSTEM. The COM unit 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/COM unit instructions.
For more information watch the tutorial videos on www.oceanreefgroup.com
USE OF THE UNDERWATER COMMUNICATION SYSTEM
For correct use of the underwater communication system read the specic manual.
INSTALLING THE UNDERWATER COMMUNICATION SYSTEM

NEPTUNE SPACE PREDATOR Owner’s Manual rel. 3.416
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 ts.
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.
TROUBLESHOOTING
* 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.

NEPTUNE SPACE PREDATOR Owner’s Manual rel. 3.4 17
#UNDERWATERNATURALLY

NEPTUNE SPACE PREDATOR Owner’s Manual rel. 3.418

NEPTUNE SPACE PREDATOR Owner’s Manual rel. 3.4 19
#UNDERWATERNATURALLY
Neptune Space PREDATOR rel 2.2
Neptune Space PREDATOR rel 2.2
Part
Code
Key
q.ty
Part
Code
Key
q.ty
O-ring balanced poppet 2.6 x 1
15439
37
1
Strap
9003 1 1
Quick release
6810 4 2
Clamping band w/buckles—
Predator
OR006803 3 1
Spring l 33
-Ø thread 0,9-Ø.int.8,4 6966 39 1
Screw M4X6
OR006804 5 1
Spring l 8,5
-Ø thread 0,9-Ø int.5,5 6980 40 1
Cap nut M4
OR006805 2 1
Balance poppet chamber
15470 41 1
NG-24 Nut M3 3mm
6529
6
3
O-ring 2068
15446
42
1
N-6AS Face seal black medium /
large
1351 7 1
Adjustment knob w/screw for Predator
–stainless steel
OR006801 43 1
N-6AS Face seal black small /
medium
1363 7 1
Trim screw for Predator
–stainless steel OR006802 44 1
Orinasal black 22mm holes(2) 28
(1)
1349 8 1
OR 2031
9409 45 1
Orinasal valve holder
1377 66 2
Predator Adjustment knob plug (LP
plug)
9822 46 1
Orinasal valve
1376 9 2
Silicone button w/Space logo
-black 20082 18 1
MI-14 Orinasal Band
6718
10
1
Diamond surface ait valve cup
8902
48
1
SB
-5C Eccentric Equal. Block (2pcs) 6924 11 2
Thread locking ring for Diamond surface
air valve
8669 49 1
Equalizer extension ,short (2pcs)
6926
2
O-ring 2081 nbr
9644
50
1
Equalizer extension , long (2pcs)
6927
2
O-ring 3112 nbr
8643
51
1
Equalizer extension , x-long (2pcs)
6928
2
O-ring 3168 nbr
8644
52
1
Screw M4x8
15255 12 1
Surface air valve body
8656 53 1
Washer M4 for screw M4x8
15253 13 1
NG
-12 O-ring 46,9x1,5 6501 54 2
SB
-5A Equalizer 6925 14 1
NG
-10 side connector bushing 6514 55 1
Regulator housing –Space
w/drain. hole
8448 15 1
MP
-2 Com System bushing rel 7.1 6549 56 1
Visor
–Space 7015 16 1
NG
-9 Side Connector 6304 57 1
Inhal. Diaphragm w/puck-Space rel
7
6781 17 1
NG
-13 Standard seal 1361 58 1
Predator reg. front cover
Anticorodal gold
20079 19 1
NG
-9B Plug 6515 59 1
Screw short –Space regulator front
cover
-M3
6962 20 1
Directional Exhaust valve cover
OR006511 60 1
Screw long –Space regulator front
cover
-M3
6961 21 2
Directional Exhaust valve deflector
6504 61 1
O
-ring 2010 6965 22 7
ER
-09 Exhalation valve 8811 62 1
Hex nut
15433
23
1
Directional Exhaust valve holder
OR006510
63
1
Body washer
15257
24
1
M-10-O ring 2131 33x1,78
6710
64
1
Insert OR 2075
6964
25
1
NG-15 Bushing w/holes
6518
65
1
Insert
6970 26 1
800 mm standard hose
9950
O
-ring x dive/predive 24 X 2 6963 27 1
Hose protector
9311
Dive/predive
6972
28
1
O-ring 2025
9673
29
1
Nozzle
9672
30
1
O-ring 114
9420
31
1
Valve body
15532 32 1
Demand lever
15448 33 1
Wedge
15447
34
1
Seat balanced poppet
8866
35
1
Balanced poppet
9675
36
1

NEPTUNE SPACE PREDATOR Owner’s Manual rel. 3.420
SL35TX First stage