Model D Rev C Pressure Reducing Regulator With Graphite/NBR Gaskets; 1" Size; Sales Kit B; Bronze Body & Spring Chamber; B4 Trim: Brass With Virgin Teflon (V-Tfe) Seat,Fluorocarbon Elastomer;(Fkm) Diaphragm; Opt-4: Stabilizer (Recommended For Gaseous Service Only)