46 CFR § 197.344 - Inflatable floatation devices.
An inflatable floatation device for SCUBA diving must -
(a) Be capable of maintaining the diver at the surface in a faceup position;
(b) Have a manually activated inflation device;
(c) Have an oral inflation device;
(d) Have an over-pressure relief device; and
(e) Have a manually operated exhaust valve.