Hospital Oxygen Service Reducing Regulator,Special; 1" Body Size; Sales Kit A; Bronze Body & Spring Chamber (500 Wog); Bronze/Brass Plug,Cage,Piston,Virgin Teflon Seat,Beryllium-Copper;(Be-Cu) Diaphragm; Fluorosilicone(Fk) Static Seal,Tfe U-Cup W/SST Engergizer Dynamic Seal; 3-12 PSId Range Spring, 2-7 PSI;Lower Spring, Internal Sensing; Spq 58512