Model D Rev D Pressure Reducing Regulator For General Service; 1" Line Size; Ductile Iron Body And Spring Chamber; S6 Trim: 316 Stainless Steel With Ethylene Propylene (EPR) Seat And Ethylene Propylene Diene (EPDM) Diaphragm; NPT Threaded End Connections; 10-40 PSI Range Spring; Polyethylene Vented Spring Chamber Plug