Appears to be made of quality materials. Before installation, you must remove the original Schrader valve. There is a gasket on the inside of the adapter where you screw it into the R12/22 fitting. Make sure it's tight. Once installed, the Schrader valve on the R134a port adapter ensures a tight seal. It is recommended to use some red Loctite to make sure it will hold and do a pressure test before fitting the R134a.
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