Replace your leaking valve cover gaskets in your 2001-2004 GM Duramax with this complete kit from Dorman. This valve cover gasket is designed to precisely match the original equipment gasket for specific engine applications. Made of durable materials, this gasket provides a long-lasting seal under extreme underhood conditions. This kit comes complete with 1 gasket, 8 injector cup o-rings, 4 valve cover bolts, 7 assorted fuel line gaskets, 4 injector seal o-rings, and 1 coolant outlet ring. For a complete set, you must purchase two.