You are buying four (4) NEW rubber caps. They are 3/4" ID rubber heater bypass caps that may fits  Chrysler, DeSoto, Dodge and Plymouth vehicles. These caps are for 3/4" OD lines. They have a .140" thick wall and are 1-1/2" 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.