OD 4/6/8/10/12mm Hose Tube M5/1/8''/ 1/4'' 3/8'' 1/2'' Male Thread Pneumatic Fast twist Fittings Quick Joint Coupler Connector
https://www.vogueparade.com/shopping/EN/200282142/1/1005001716243671/od-4681012mm-hose-tube-m518-14-38-12-male-thread-pneumatic-fast-twist-fittings-quick-joint-coupler-connector//