If it's like the later model Force engines, I've never seen a gasket between the adapter plate (which is bolted to the bottom of the power head) and the mid leg on any of the power heads that I've pulled off. Just RTV silicone. I could be wrong but I've never seen a gasket there. There is a gasket between the adapter plate and the power head, but I've never seen a gasket between the adapter plate and mid leg. I use high temp RTV silicone to seal it when dropping the power head back on to the mid leg.