Model "D" Pressure Reducing Regulator,Tfe Gaskets (Opt-45); 3/4" Size; Sales Kit A; Cf8m Body & Spring Chamber; S7 Trim: 316SST With V-Tfe Seat, Fluorocarbon Elastomer (Fkm);Diaphragm; Opt-4: Stabilizer (Recommended For Gaseous Service Only); Opt-55: Cleaned For Oxygen Service Per Spec #S-1134