Second-stage regulators are UL® listed regulators designed to reduce the outlet pressure from a first-stage regulator, usually 10 psig to 11 in. w.c., in domestic installations. Vents are screened with standard orientation over the inlet, but other orientations are available. R622, R642 and R652 are equipped with a stainless steel inlet screen to reduce the amount of debris entering the regulator. HSRL regulator designed for light commercial applications up to 2,600,000 BTU per hour. It utilizes a high strength cast iron body and a 3/4 in. NPT drip lip vent design. The PFC and SFC feature an angle-body design. The design also includes a high capacity internal relief valve