MODEL "1000HP-1+6" DIFF PRESS REG,SGL DIAPH,GRAPHITE/NBR GASKETS 1/2" SIZE,GASEOUS JET; SPECIAL BODY & SPRING CHAMBER MATERIAL; S1 TRIM: METAL SEAT,316SST CYLINDER & PLUG,302SST DIAPHRAGM; NPT SCREWED; 40-100 PSDG RANGE SPRING; PER SPQ NUMBER 53176 SST BODY, SPRING CHAMBER & CLOSING CAP;