Features and Benefits:

Contains adapters FZ 450-3 tank adapter for pressurizing the cooling system
FZ 450-4 A cap adapter for checking pressure relief valve in radiator cap
FZ 450-1 rubber plug used with FZ 450-3.
Used in conjunction with Stant tester # ST 270.
Applicable: All popular trucks with the larger diameter (2-11/16" 0. D. "B" size) filler neck and late model GM X-cars with the 2.5 liter engine and J-cars with the 1.8 liter and 2.0 liter engine.