Uniseal Uniseal (3/4" inch Pipe) Pipe Grommets Pipe To Tank Seals - Uniseal $2.75 Uniseal® is simply the world’s best seal and installing the Uniseal® is a simple process. After cutting a hole in the wall of a tank or other surface, the seal is inserted. Then the pipe is coated with a slippery detergent and pushed into... Add to Cart