Solid copper gasket for the combined inlet and exhaust manifolds to head joint on the TD/E/F 21 models. The exhaust manifolds are prone to blowing where the two halves come together in the middle. If the blow is slight, this gasket should cure the problem. However, if there is bad erosion of the manifold or head, the only solution is to have the faces planed. The gasket is already annealed and ready to fit.