This unique, high-quality one-piece EPDM replacement fits most RV and Marine A/C & Heat Pump units including those made by Dometic, Airxcel, Advent, Atwood, and Coleman. The one-piece design ensures a no-leak functionality. High quality closed cell EPDM sponge rubber yields higher UV, ozone, and weather-resistant durability than what is originally supplied! Easy to use, featuring a pressure-sensitive adhesive-backing to hold the gasket in place during installation. Includes two (2) 7" leveling blocks, and one (1) 14” strip made of the same materials to fit the layout of current A/C units. See the attached instruction sheet for directions.