Seals and gaskets perform mainly two functions. One is to prevent the intermixing of different fluids, say inside an engine. For example, keeping lubricating oil, coolant, air-fuel mixture, exhaust gases etc, all separated from each other. The second function is to prevent fluids from inside the engine from spilling out. Find all kinds of gaskets-and-sealing-systems from all the leading brands at theautopartsshop.com