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- I'm a Fish!
how does tank height effect first stage location? The tank is positioned based off of the valve knob, 0 other factors are relevant. Literally, no other factors matter in bottle placement. The bottle has to be high enough for you to reach that knob, and since most knobs are about the same height off of the top of the bottle, the cam band placement is identical in relation to the crown regardless of diving a LP121 which is 29" tall, or an S53 which is 19" tall. The only difference is how far forward you're pushed or how far back you lean when you rest the butt of the tank on a flat surface. I work with new students all the time fitting them in Halcyon Eclipse rigs, and the only problem resides with people with short torsos not being able to comfortably sit with an Al80 since they are too long for most divers.