Matheson Dual-Stage Deluxe Brass Regulator, 81L-580, Delivery Pressure 2-15 psig, CGA 580 inlet Chrome plated brass body Neoprene diaphragm (1st and 2nd stages) 2-1/2" inlet and delivery pressure gauges Equipped with outlet needle valve and 1/4 NPTM outlet connection One-piece encapsulated seat with (10u) internal fitter to protect against contamination