Model D Rev D Pressure Reducing Regulator For General Service; 3/4" Line Size; Sales Kit B; Bronze Body And Spring Chamber; B2 Trim: Brass With BUNA-N (NBR) Seat And Neoprene (BC) Diaphragm; Opt-4: Piston Stabilizer For Gaseous Service; Opt-56: Non-Oxygen Cleaning Per Cashco Specification S-1542