Hollis Explorer User Manual - page 21
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In closed circuit mode, block the inhale (diver's left) side and suck into the
mouthpiece.
Faults:
• Mushroom valve (right hand side) leak. Remove the carrier and inspect
mushroom valve and O-ring. Replace as needed.
• BOV barrel O-ring or activation handle O-ring leak. Have the O-rings
replaced.
Remove both hoses from the Canister (leave connected at the BOV). Put
the BOV in open circuit mode. Block the exhale hose end and blow into the
inhale hose end. Listen and observe for any signs of leaks from the mouth-
piece, hose or hoses ends.
Faults:
• If a leak is detected from the mouthpiece outlet, then the barrel O-rings
need replacing.
• If a leak is detected at the hose ends, then replace the hose end O-rings.
• If a leak is detected along the hoses, then refer to your Hollis dealer for
hose replacement.
BOV SECONDARY TEST
In open circuit mode, with the second stage BOV (HP) gas turned OFF.
Remove the breathing hoses. Block both inhale, exhale, ports, and the LP
inlet to the second stage. Then inhale from the mouthpiece.
Faults:
• If a leak is heard, the exhaust valve or the diaphragm may need replac-
ing. If a fault is found, Refer to a Hollis service center.
BREATHING HOSE ASSEMBLY
Clean and inspect the hose end O-rings. Then reassemble.
BREATHING HOSE ASSEMBLY TESTING
Block one end of the hose and blow into the other. Look for leaks along the
hose while submerging it. Repeat for the other hose.
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