Manifold fitting for a compressed air tank

A manifold fitting for a compressed air tank comprising:

• an elongate main body of hexagonal cross-section with first and second ends of reduced circular cross-section;
• said body having an axial passage therethrough from one end to the other;
• said first end being externally threaded for attachment of the fitting to a tank for communication with the tank via the portion of the axial passage in said first reduced end;
• said body having a first lateral opening extending inwardly to said axial passage from a first face of the six faces of the body;
• an outlet member threaded in said first lateral opening in the body having a valve seat at its inner end toward said passage;
• said second reduced end being adapted for passage of air via the portion of said axial passage therein;
• said body having a second lateral opening extending inwardly to said passage from a second of the six faces of the body opposite said first face, said second lateral opening being opposite said first lateral opening and in axial alignment therewith;
• a valve member threaded in said second lateral opening extending across said passage with space around said valve member for flow of air, said valve member being adapted to be threaded inwardly in said second lateral opening for engagement of its inner end with the valve seat and to be threaded outwardly with respect to said second lateral opening to an open position for flow of air from the tank through said passage and through said outlet member;
• said body having a third lateral opening extending inwardly from a third of said six faces to said passage;
• a pressure relief safety valve comprising a valve body threaded at one end constituting its inner end in said third lateral opening in the body, a vent port in the valve body, a valve member movable in the valve body from a closed position blocking said port to an open position for escape of air through the port, and spring means for biasing the valve member to its closed position;
• and
• said body having a fourth threaded lateral opening extending inwardly from a fourth of said faces to said passage for receiving a pressure gauge.