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Blue Plastic Cap 17mm Threaded R134 Refrigerant Can Tap Valve Opener Thread Diameter : 10.5mm / 0.41" Bottom Thread Diameter : Inner: 10.5mm / 0.41" Outer: 17mm / 0.67";Total Size : 69 x 40mm / 2.7" x 1.6" (H*W) Weight : 69g Serve as a bottle opener for R134 refrigerant Features built in safety valve and neoprene gasket for leak-proof operation. Screw on design, and easy to use