This is one of those details we do not need to over analyze. The bottom line in stage/deco/long hose regs need to fit into your buddies mouth at a moments notice. This is the DIR requirement.
Any mouthpiece that will do this without cause additional stress to the situation is acceptable. I've had buddies whine about standard mouthpiece, and about comfobites, but all of them work. If you have something other than the standard mouthpiece, it can still be used, but go over it in your pre-dive head to toe.
Any mouthpiece that will do this without cause additional stress to the situation is acceptable. I've had buddies whine about standard mouthpiece, and about comfobites, but all of them work. If you have something other than the standard mouthpiece, it can still be used, but go over it in your pre-dive head to toe.