This valve cover gasket is a high-quality product designed for use with 8.3 ISC QSC ISL QSL Cummins Engines. It is made by DCEC, a trusted brand in the industry, and is an essential component for ensuring the proper functioning of the engine. The gasket is made in China and has interchange part numbers of 3943303, 3943864, and 3939284, making it easy to find the right replacement for your engine. It is a type of valve cover gasket that is specifically designed for use with Cummins Engines. This product is perfect for those looking to replace their valve cover gasket and ensure the proper functioning of their engine.