1/8" 1/4" 3/8" 1/2" BSPP Female Full Ports Air Check Gas Oil Water Valve One Way Non Return Nickel-Plated Brass Valve
https://www.vogueparade.com/shopping/EN/200282142/1/1005001288293084/18-14-38-12-bspp-female-full-ports-air-check-gas-oil-water-valve-one-way-non-return-nickel-plated-brass-valve//