MODEL "1000HP-1+8" DIFF PRESS REG,DBL DIAPH,GRAPHITE/NBR GASKETS 2" SIZE,GASEOUS JET; DUCTILE IRON BODY & SPRING CHAMBER WITH CLOSING CAP; B1 TRIM: METAL SEAT,BRASS CYLINDER,416SST PLUG,302SST DIAPHRAGM; NPT SCREWED; 10-40 PSID RANGE SPRING; B PART KIT