1/4'' connector with Anti-Blowback Valve on end. The anti-blowback valve (ABB) prevents any refrigerant loss when disconnecting hoses from fittings, eliminating harmfull refrigerant burns. Red in color. 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.