It is really a matter of preference. Recreational SCUBA has always been vavle up and it is hard to change 100 years of tridition.
Commercial divers (in the U.S.) wear a cylinder on their back as an emergency breathing source and usually it is valve down so the diver can reach the valve handle.
Navy divers wear them valve up..
Why, I don't know.
Commercial divers (in the U.S.) wear a cylinder on their back as an emergency breathing source and usually it is valve down so the diver can reach the valve handle.
Navy divers wear them valve up..
Why, I don't know.