Model "DA4" Pressure Loaded Reducing Valve (Series IV)-PLPRV; Body Size 2",Standard Diaphragm Construction; Sales Kit A; Bronze Body & Loading Chamber; M Trim: Monel Trim With V-Tfe Seat,Fluorosilicone(Fk) Diaphragm; Fluorosilicone(Fk) Static Seals,Tfe Cap Seal W/Fluorosilicone(Fk);Energizer Dynamic Seal,Gf-Tfe Wiper; Opt-55: Cleaned For Oxygen Service Per Spec