Body Sizes and End Connection Styles (inlet x outlet): 1/4 inch x 1/2 inch FNPT, FPOL x 1/2 inch FNPT, 1/4 inch x 3/4 inch FNPT, FPOL x 3/4 inch FNPT Maximum Allowable Inlet Pressure: 250 psig / 17,2 bar Outlet Pressure Ranges: 9 to 13 inches w.c. / 22.4 to 32.4 mbar spring range CapacityUp: to 950,000 BTU/hr Vent Size: 1st Stage : 1/4 NPT Inverted Flare 2nd Stage : 3/4 NPT screened Temperature Capabilities: -20° to 160°F / -29° to 71°C Approximate Weight: With FPOL: 2.9 lbs / 1310 g With NPT fitting: 2.5 lbs / 1125 g