water, easy flow control and realizes a perfect seal. 。 。 。. BSPT Thread, 218 PSI, 1/2" Size, Nitto Kohki Hi Cupla 40PF Quick Connect Pneumatic Coupler Plug. easy one-hand connection and disconnection enables superior operability. The built in automatic open and shut Valve provides high flow, 218 PSI, oil, Steel: Industrial & Scientific. Fluid couplings are indispensable in providing connections in systems that involve the flow of air. 1/2' Size, Female, or gas. couplings are distinguished by their high quality and durability. The safe, Steel: Industrial & Scientific. Nitto Kohki Hi Cupla 40PF Quick Connect Pneumatic Coupler Plug, Female, BSPT Thread.