Regulator for diving

A regulator for diving comprising a basic structure adapted to be kept in substantially air-tight condition so long as a diver is actually using it, a pressure-controllable air supply mechanism provided in said basic structure to supply the diver with air, a mouthpiece connected to said basic structure and a check valve provided in said basic structure so as to be switched between opened and closed positions, said regulator further comprising:

• said air supply mechanism having a tubular housing to be connected to an air supply source provided externally of said basic structure, a pressure reducing valve provided in said tubular housing and a valve seal against which said pressure reducing valve is releasably pressed wherein said valve seal is formed on a front end of an air guide tube which is withdrawably inserted into said tubular housing and said air guide tube is formed with threads on an inner surface of a rear end thereof, the rear end opposite to the front end of the air tube guide.