new old stock  systems high sider adapter for gms and others vehicle   made by Interdynamics                                                                                                              -


R12 AUTO A/C HIGH SIDE ADAPTER

Adapts R-12 Automotive High-Side fittings (3/16" Male SAE high side service ports on newer (1977 & up) R12) model vehicles to 1/4" Male SAE to allow for High Side monitoring with standard 1/4" hoses!.

Schrader valve is installed on the 1/4" Male side and a depressor is installed for the 3/16" side!!

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