You are buying four (4) NEW rubber caps. They are four (4) 5/8" ID rubber heater bypass caps that are used on various years and models of Buick, Cadillac, Chevrolet, Oldsmobile and Pontiac vehicles. These caps are for 5/8" OD lines & fittings.
The 5/8" caps have a .170" thick wall and are 1-1/16"long. They are used to block off heater cores, intake manifold fittings, water pump hose fittings, etc... 

Please note that this auction is NOT a kit for any specific vehicle or application. Please check your application and compare to the sizes we have listed. If you have any questions please contact us before you buy.