Designed for use as the first regulator of a two-stage regulator system ; Compact design provides easy installation in tight installations and underground tank installations ; For domestic applications, constructed of corrosion and wear resistant materials ; Positive draining spring case ; Red straight through design vent pointing down ; Features overpressure protection, inlet screen and built in 1/8'' gauge taps in both the inlet and outlet sides ; 1,100,000 BTU/HR ; 1/4'' FNPT Inlet ; 1/2'' FNPT Outlet ; 10 psig Outlet Pressure Rating^*MUST BE INSTALLED BY TRAINED PERSONNEL IN ACCORDANCE WITH NFPA 58 & 54 STATE AND LOCAL CODES