I have a 6' (Piranha mfg.) closed bottom DSMB, but it does not have an OPV.
I've never tried shooting it below 30', but at that depth and shallower, I'm unable to blow enough air into it to get close to over expansion.
Is this a problem waiting to happen? I like the longer length (just in case I really need to get spotted on the surface), but I'm cheap by nature and can't find an alternative reasonably priced 6' DSMB
DSMB is here: http://www.piranhadivemfg.com/item/Closed-Bottom-6ft-ORANGE-SMB-2996
I've never tried shooting it below 30', but at that depth and shallower, I'm unable to blow enough air into it to get close to over expansion.
Is this a problem waiting to happen? I like the longer length (just in case I really need to get spotted on the surface), but I'm cheap by nature and can't find an alternative reasonably priced 6' DSMB
DSMB is here: http://www.piranhadivemfg.com/item/Closed-Bottom-6ft-ORANGE-SMB-2996
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