R622-Dff 2Nd Stage Regulator, 9-13" W.C Spring, 3/4" X 3/4" Npt R600 Series second-stage regulators are Underwriters Laboratories (UL) listed designed to reduce the Outlet pressure from a first-stage regulator in domestic LP-gas (propane) systems installations. Type R622 is designed for two-stage domestic applications up to 1,400,000 BTU per hour/15,8 scmh. Type R622 contains a high performance Relief Valve and a large 3/4-inch Screened vent to limit downstream pressure to less than 2 PSIG/0,14 bar in an overpressure situation. Types R642 and R652 are designed in an angle body and back mounted design !!! WARNING !!! Failure to follow these instructions or to properly install and maintain this equipment could result in an explosion and/or fire causing property damage and personal injury or death. Fisher equipment must be installed, operated and maintained in accordance with Federal, state and local codes and Fisher instructions. The installation in most States must also comply with NFPA no. 54 and 58 standards. Only Personnel trained in the proper procedures, codes, standards and regulations of the LP-gas industry should install and service this equipment. BUYER AGREES THAT RESPONSIBILITY FOR PROPER SELECTION, INSTALLATION, USE AND MAINTENANCE OF ANY PRODUCT REMAINS SOLELY WITH THE PURCHASER AND END-USER. BUYER AGREES TO COMPLY WITH THE ABOVE WARNING AND ALL INSTRUCTION MANUALS, BULLETINS AND INSTALLATION GUIDES ASSOCIATED WITH THIS PRODUCT. Body Sizes and End Connection Styles (inlet x outlet): 3/4 x 3/4-inch FNPT Maximum Inlet Pressure: 10 psig / 0,69 bar : Emergency Inlet Pressure: 50 psig / 3,4 bar Outlet Pressure Ranges : 9 to 13-inches W.C / 22 to 32 mbar Capacity : 1,400,000 BTU/hr Vent Size : 3/4 NPT screened