AP Diving

AP Diving or Ambient Pressure Diving, formerly known as A.P.Valves, is a British manufacturer of diving equipment at Water-Ma-Trout in Helston, Cornwall, England. They produce a range of scuba and surface-supplied diving equipment including buoyancy compensator jackets and the Inspiration range of electronically controlled closed circuit diving rebreathers.

The firm started in 1969 making a valve to allow a diver to breathe from a stabiliser jacket buoyancy compensator's inflation cylinder. They progressed to making divers' adjustable buoyancy life-jackets and stabiliser jackets, and then other diving equipment such as rebreathers. and diving accessories etc.

They often exhibit at diving trade shows.