3-Pack of 1/4'' standard hoses with Anti-Blowback Valve on end. The anti-blowback valve (ABB) prevents any refrigerant loss when disconnecting hoses from fittings, eliminating harmfull refrigerant burns. Adjustable valve core depressor opens all out of tolerance Schraeder valves. All-weather flexibility and strength. Blow-off grooves channel refrigerant to prevent spray back.