OD 4/6/8/10/12mm Hose Tube 1/8''/ 1/4'' 3/8'' 1/2'' BSP Male Thread Pneumatic Fast Twist Fittings Quick Joint Coupler Connector
https://www.vogueparade.com/shopping/EN/200282142/1/1005003737882521/od-4681012mm-hose-tube-18-14-38-12-bsp-male-thread-pneumatic-fast-twist-fittings-quick-joint-coupler-connector//