Power inflator hoses should run over the diver's left shoulder and be long enough to comfortably supply the power inflator, while not so long that they bulge out to either side. In turn, the inflator itself should be long enough that, with one hand controlling all maneuvers, a diver is able to easily reach his/her mouth, his/her dry suit inflation valve, and his/her nose; it should also be long enough that, if necessary, one could breathe out of it by simultaneously holding down both buttons.13 The inflator from the wings runs over the shoulder and through a small bungie attached with the left chest D-ring. This keeps the inflator where it can be located instantly. To provide additional redundancy when using two first stages, the inflator hose should always be run from the right post. This requirement is illustrated in the case of a diver's left post rolling off or breaking. If the inflator is run from the left post, the diver will simultaneously lose not only the use of the backup regulator around the neck but also the ability to inflate the BC. These two problems together could be inordinately compounded by an out-of-air situation in which a diver would not only be without the means of controlling his/her buoyancy but would also be deprived of the use of a third regulator (cf. note 7). In addition, the inflator mechanism itself should not be designed to fill rapidly; this allows one to manage a runaway inflation more effectively, should an inflator failure cause a continual addition of air.
