Is there such a thing ?
- Thread starter colinicky
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kwinter
PITA
I'm not sure why you are concerned about water ingress, but it can be plugged without removing the QD stud. I don't know of a single piece that would do it, but you can easily get a BCD female socket adapter to 9/16 male. This adapter is used to convert a reg hose into a BCD hose. Now you just have to find a way to plug the 9/16-18 male end. Omniswivel makes a dust cap set for 9/16. Part DS-1002. I'm not sure if it is o-ring sealed or water tight. If not, then there are adapters to convert from 9/16-F to 1/4 NPT-M, and then you could cap the 1/4 NPT easily.
Seems like a lot of bother.
Seems like a lot of bother.
Michael Thornton
Rebreather Enthusiast
The omniswivel dust cap is not pressure tight since it does not have the internal barrel where the o ring goes.
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paulraymaekers
Active Member
each MAV comes with the rubber cap installed for the off board connector
& that is totally water tight at depth ???
Garth
Tunnel Vision
Interesting thread and sounds like a valid concern but I would wonder how frequently you are going to press the wrong button. If it's frequent enough it might be wise to consider not using one of those blocks. Is there another way?
Maybe develop a script to say in your head every time you need to use the MAV?
Manually controlling a rebreather is a very intentional act and haphazardly mashing buttons is not wise.
Say water comes in your diluent block as you mentioned. What is the major concern? Obviously water is best outside of a valve but the main concern I have is with the oxygen side and solenoid.
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Maybe develop a script to say in your head every time you need to use the MAV?
Manually controlling a rebreather is a very intentional act and haphazardly mashing buttons is not wise.
Say water comes in your diluent block as you mentioned. What is the major concern? Obviously water is best outside of a valve but the main concern I have is with the oxygen side and solenoid.
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lizardland
Active Member
Are there NRV's in the block? If not then wouldnt the stub simply vent gas from the lp circuit if you pressed the wrong button?
I have done it by mistake on a couple of occasions on my old revo. My new revo is front mav only no rear buttons any more
All the mav buttons feed out on one hose into the top opv housing so other than dumping any water into the exhale lung no issue other than gradually messing up buttons. The solenoid has it's own dedicated feed so water would not enter the solenoid. On my old unit I did manage once to get the mav quashed by the harness & me which resulted to buttons being pushed by accident.
No NRV in the block. IF you were on descent at the point of the lungs hitting the ADV & you breathing in & depressed the button in effect you would "suck" water in .
paulraymaekers
Active Member
just try to pull it off at depth
Garth
Tunnel Vision
Trust Don when he speaks about not bitching up his rebreather. He has been on a quest to figure out every way to bitch it up and we are all wondering when this is going to end...
At some point he will be qualified to create an "anti-bitching" manual that will be sought out by everyone in the industry... He will be some kind of legend...
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DSix36
Well-Known Member
What the hell do you mean "will be". LOL
A little trick I learnt recently, with dill tank open press the dill button and the bottom button simultaneously and any water that is in the line is quickly blasted out the QD .
In regards to the OP I have found in nearly 200hrs on my rEvo I can't recall ever pressing the bottom button by accident, you develop the mussel memory pretty quickly, top for add dill middle recessed button add oxygen, and if you do happen to press it, blast any water out as I described above.
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paulraymaekers
Active Member
well... different experiences over the world
I had clients complaining that the cap was impossible to remove under pressure (when they wanted to plug in off board): just due to the water pressure.
Just pressing the button once solved the problem
if you fear water into the bottom connector, the trick is easy (as explained here): once out of the water, push the dill add and off board add together for 2 seconds, and any water that would have come in, is immediately out
paul
If you want a fun show, just pop the QD on the output line of the block and hit the add dil button. I did this after having to do a series of off-board gas switches on my last dive (lost O2 due to extruded o ring during a cave dive). Whatever water was in the block went flying out in a spectacular fashion. Almost looked like a burst of steam. Freshwater diving has its advantages.
Fldvr
Member
You could cut the end piece off of a lp hose, seal the end with a bolt and you'll never have a drop of water in the lower buuton. I did this on the aluminum Mav out of necessity diving in salt water. The dil flush method is great, I do it every time I soak the unit. ..hitting the o2 button also flushes the solenoid from any m moisture that gets in and prevents it from rusting (stainless steel I know).
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matt
Well-Known Member
kwinter
PITA
See posts #3 and 4. Also the QD you pictured is not a standard BCD one. It is a large bore Scubapro QD.
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