The McCormick 3681E028 is a genuine cylinder head gasket designed for optimal sealing and performance in Perkins 1000 Series engines, including models 1004.4, 1004.40, 1004.40T, 1004.40TA, 1004.42, 1004.4T, 1006.6, 1006.60, 1006.60T, 1006.60TA, and 1006.6T. This critical engine component ensures a tight seal between the cylinder head and engine block, preventing leaks and maintaining proper compression. It is also compatible with a wide range of McCormick tractors such as the CX, MC, MTX, and X series, ensuring reliable engine operation.