One touch fittings for hoses made of plastics are used to connecting the hoses and other elements in pneumatic systems. Uncomplicated construction and high quality guarantee easily and quick installment or disinterment. The body material is brass, the sleeve material is POM. The lock claw material is SUS, the sealing material is NBR. Tightness connection between the fitting and the tube is made after pushing the end of hose in the fitting body to feel resistance. Disconnection is possible after pushing the blue plastic ring.