Model 1000LP Rev A Pressure Reducing Regulator, PTFE/Al-Silicate Gaskets; 1/2" Line Size, Gaseous Jet; Carbon Steel Body With Carbon Steel Spring Chamber; S2N Trim: Metal Seat, 316 Stainless Steel Cylinder, 416 Stainless Steel Plug, Neoprene (BC) Diaphragm; OPT-34: Mates With ASME 150 Raised Face Flanges With 14" Face To Face Dimension; 1-5 PSIG Range Spring; OPT-12: One-Step Reduced Orifice