Whether you're buying new, used or retrofitting an old boat, it's crucial you have the right marine engine parts to keep it running at its best. A watercraft with an inboard engine requires boat engine seals to keep the water out of the engine while lubricating the shaft at its point of exit. It's your engine's first line of defense against oils, dirt and contaminants that may enter and damage the engine. At Discount Inboard Marine, we carry a diverse selection of marine engine seals and parts to prevent any potentially disastrous consequences. Need help finding the right boat engine seals for your watercraft model? Reach out — our technical assistants are here to help.