Model 1000LP Rev A Pressure Reducing Regulator, PTFE/Al-Silicate Gaskets; 1/2" Line Size, Gaseous Jet; Sales Kit B; Carbon Steel Body With Carbon Steel Spring Chamber; S40v Trim: 316 Stainless Steel Cylinder, 316 Stainless Steel Plug With Fluorocarbon Elastomer (FKM) Seat, Fluorocarbon Elastomer (FKM) Diaphragm; OPT-30: Mates With ASME 150 Raised Face Flanges; OPT-12: One-Step Reduced Orifice; OPT-40: Construction Per NACE Standard MR0175