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[Convert R12 R22 to R134a] The Boltigen AC fitting port retrofit adapter can help you replace your old r12 r22 service port with r134a service port to meet your need. Ideal air conditioning conversion adapter kit.[Dimension] The Bcltigen Low/High pressure side retrofit adapters win convert your old 1/4“ SAE or 7/16'-20 UNF R12 R22 charging port and make it accept the R134a quick disconnect nose. Low Side, 1/4" (7/16- 20) x 13 mm (Blue). High Side, 1/4“ <7/16"- 20) x 16 mm (Red).[Excellent Sealing] The Boltigen r12 to r134a adapters built-in green O-rings, and Valve Core, for ensuring a complete hermetic seal. And the extral valve core removal tool can help you install or remove valve core according to your needs[Brass Material] The Boltigen r12 to r134a retrofit adapters are made of high qualrty brass.surface chrome plating with resistant to corrosion, and durable advantages