Model D Rev D Pressure Reducing Regulator For General Service; 1/2" Line Size; Ductile Iron Body And Spring Chamber; B4 Trim: Brass With PTFE Seat And Fluorocarbon Elastomer (FKM) Diaphragm; NPT Threaded End Connections; 30-80 PSI Range Spring; Opt-3: Handwheel And Locking Lever; Opt-25S: Stainless Steel Vented Spring Chamber Plug