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I have a pair of Nova Seawings and I can't get on with them. They are slightly boyant which throws my trim out to the point that I don't have any more weight to move down. I have resorted to loosening the BCD straps and letting all the kit drop down. Either that or using ankle weights. I use...

The calculations are easy. The problem is the gas heats up when you fill and the pressure drops when it cools. I have found two ways: Allow the gas to cool and top up to the correct pressure Add a bit more gas to allow for cooling. The second method requires some guesswork based on how much gas...

Surely this argument is moot as a cylinder is only considered oxygen clean for 15 months after the last clean, even if only filled with modified E grade air. Colin

I use a smart car. It takes the rebreather, drysuit, bailout cylinder and all the other bits that go with it. There's room for an occasional spare cylinder or tub of sofnolime. Not much room for a buddy Colin