1/8" 1/4" 3/8" 1/2" BSP Male To Female Brass Pneumatic Check Valve Full Port One Way Non-return Valve For Air Water Oil Gas
https://www.vogueparade.com/shopping/EN/200282142/1/4000903781289/18-14-38-12-bsp-male-to-female-brass-pneumatic-check-valve-full-port-one-way-non-return-valve-for-air-water-oil-gas//