Model D Rev D Pressure Reducing Regulator For Cryogenic Service (Requires Cryogenic Lubricants During Assembly); 3/4" Line Size; Carbon Steel (LCC) Body With Carbon Steel (LCC) Spring Chamber; S40C Trim: 316SST With Virgin Teflon (V-Tfe) Seat, Special Bc Diaphragm; NPT Threaded End Connections; 10-40 PSI Range Spring; Opt-4: With Piston Stabilizer For Gaseous Service; Vented Spring Chamber Plug (Polyethylene); Opt-40: NACE Construction Per MR0175