4999778 Rocker Lever Housing Gasket

For Cummins ISX12, ISX13, QSX11.9, ISZ and QSZ Z13 engines, this 4999778 rocker lever housing gasket offers reliable sealing performance. It blocks lubricating oil from leaking out of the valve mechanism and keeps dirt out of rocker assemblies. Resistant to sustained high operating temperature and chemical erosion from engine oil. Simple placement during cylinder head disassembly for professional engine rebuild projects.