Model "DA4" Pressure Loaded Reducing Valve (Series IV)-PLPRV; Body Size 2",, Rebuild Kit for D49-BMJ7-P1310M00C; Standard Diaphragm Construction; Bronze Body & Loading Chamber; Monel K-500/S Plug/Cage/Piston Guide Bearing,Fluorosilicone(Fk);Diaphragm,Polyall Seat; Fluorosilicone(Fk) Static Seals,Tfe Cap Seal W/Fluorosilicone(Fk);Energizer Dynamic Seal,Gf-Tfe Wiper; Opt-55: Special Cleaning & Packaging For Oxygen Service Per Spec#;S-1134