Model D Rev C Pressure Reducing Regulator With Graphite/NBR Gaskets; 1" Size; Sales Kit B; Bronze Body & Spring Chamber (Opt-80); B0 Trim: Brass Metal Seat,Phos.Bronze Diaphragm; Opt-80: 100-250 PSIG Range Spring; Opt-4: Stabilizer (Recommended For Gaseous Service Only)