Features and Benefits: For pressurizing Cooling Systems; All metal construction with 52mm x 2.5mm Buttress Threads; Use with CTA #7050 Pressure Tester; Compatible with other Pressure Tester brands; Radiator Adaptor. For pressurizing Cooling SystemsAll metal construction with 52mm x 2.5mm Buttress ThreadsUse with CTA #7050 Pressure TesterCompatible with other Pressure Tester brands