What sets Nomadic Cooling products apart from the rest? Our premium rooftop waterproof gasket is just one of the many components that make our 12v Rooftop AC's the best on the market. This high-quality one-piece replacement fits most RV and Marine Roof Mounted A/C and Heat Pump units. The one-piece super high-density rubber 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 3M adhesive-backing to hold the gasket in place during installation.