Product Description

Block tester Kit Fluid for the block tester kit that detects exhaust gases in the radiator and so checks for gasket damage, cracked or warped cylinder head. When fluid turns from blue to yellow a combustion leak is present. The kit is supplied with a bottle of test fluid which works well on petrol engines. For those who require a more sensitive fluid for checking diesel engines use L7573 indicator fluid, which changes from red to yellow in the presence of combustion gases.