Model D Rev D Pressure Reducing Regulator For General Service; 3/4" Line Size; Stainless Steel Body And Spring Chamber; SK Trim: 316 Stainless Steel With Fluorocarbon Elastomer (FKM) Seat And Diaphragm; Opt-31P: British Standard Pipe Parallel Threaded End Connections; 30-80 PSI Range Spring; Polyethylene Vented Spring Chamber Plug; Opt-87: With 1/8" NPT Inlet And Outlet Gauge Ports And Plugs