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There is an adaptor for the Mares Abyss. I have bought two of them from Divers Supply in Macon, Ga. I don't know what you call them but they work just fine.
I just used the 1/2" adapter on mine. I've used it for years and haven't had an issue. I realize it's an "additional failure point," but it's what was readily available when I converted mine over. It took me no time to change the hose over. I just used a standard 7' hose and the adapter (1/2" to 3/8" I think).
Shane