Capless cooling system tester uses an inflatable bladder to seal the coolant header tank or radiator. Bladder system can be used on both screw and bayonet fittings and seals 90% of cars and light commercial vehicles straight out of the box. Supplied with two adaptors, enabling testing of VAG vehicles with internal threads on header tank. Features quick release couplings, easy-to-read pressure gauge and release valve. Model No. VS0012