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Accurate & fast diagnosis of cylinder head gasket leaks Reveals the presence of combustion gases in the cooling system due to leaking head gaskets or cylinder block issues When CO combustion gases are detected, the Tester Fluid will turn Yellow/Green confirming a leak Can be used on all Petrol, Diesel & LPG Water Cooled Engines Universal cone adaptor fits most vehicle radiators & coolant storage bottles Simple hand pump design The USA produced Tester Fluid can be used several times over using the Empty Fluid Bottle