5M2667 Pre-Combustion Chamber Gasket Fits Caterpillar Various ApplicationsOne New Aftermarket Replacement Pre Combustion Chamber Gasket Fits Caterpillar (Fits CAT) Engines This aftermarket replacement pre combustion chamber gasket (Fits CAT part 5M2667) seals the precombustion chamber against the cylinder head in Fits Caterpillar 3304 and 3306 diesel engines. It is installed on the chamber body before the chamber is threaded into the head, providing a critical combustion seal. This gasket is used across a wide range of Fits