separate sealed boots could be used if desired but the suit with integral boots is more secure under working conditions a single waterproof zipper 22 across the shoulders at the back provides easy access to the suit the suit is constructed primarily of neoprene coated and reinforced with nylon or similar material the parts being joined by a combination of adhesive bonding and stitching hot water is supplied through a hose 24 to a manifold valve 26 mounted on the side of the suit distribution being described in the above mentioned u s patent a suitable water heater is disclosed in applicant 39 s prior u s pat no 3 762 392 entitled hot water heater system for divers in fig9 the water heater 27 is shown as being carried on a vessel 29 and has a pick up hose 31 extending into the water of supply as illustrated breathing gas is supplied by a pump 33 to helmet 18 through a hose 28 which is coupled to an inline heater 30 in which the gas is heated by the hot water supply for the diver 39 s comfort this type of heater is disclosed in applicant 39 s u s pat no 4 013 122 entitled divers gas heater the outlet valve 32 is installed in the chest portion of the suit with the control knob 34 visible and accessible to the diver outlet valve 32 includes a cylindrical body 36 having a rear flange 38 which is.