All Interceptors Direct replacement gaskets are made from premium high-density foam rubber – the same material used in the original manufacturing of Rockford Separators brand interceptors and separators. Available in 10’, 15’ and 25’ lengths, they feature a peel and stick backing that makes them very easy to cut to length and install. They are designed to create an airtight seal between the grease or oil separator cover and the unit. This airtight seal is essential for not only reducing odor, but also preventing leakage.