This line tap valve can be used on 1/4", 5/16" and 3/8" refrigerant pipework and for R12, R22, R134a and R502 systems although it is also widely used on R600a iso-butane systems. When installed, the gasket actually compresses the copper tubing. 020″ creating a “Permanent”, leak-proof seal that will withstand any pressure and temperature for the life of the unit.
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