Colson 1/2 inch BSPP double block and bleed valve 316L to NACE MR-01-75 / ISO 15156, ball/needle/ball configuration, ball valves fitted with PVDF seats, PTFE / RTFE seals and st/st lever handles & T-bar vent, 1/2 inch BSPP female inlet & outlet w/ 1/4 inch NPT female vent, 6,000 psi
