Stop roof leaks and drafts at the source. The Dometic 3310718.006 gasket kit is the correct OEM-spec replacement for the deteriorated or compressed styrofoam roof gasket found on a wide range of Dometic rooftop air conditioner units. Adhesive-backed for a clean, repeatable installation with no messy sealants required.
The roof gasket on a Dometic rooftop air conditioner sits between the unit's base pan and your RV's roof decking, creating a weathertight seal around the 14 x 14 inch vent cutout. Over time, exposure to UV, heat cycling, and compression permanently deform the original styrofoam gasket -- leading to water intrusion, air leaks, and potential interior damage.
Dometic part 3310718.006 restores that seal with a fresh, properly dimensioned replacement. At 1 inch thick with a 14 x 14 inch inner opening and a 17 x 17 inch outer footprint, it matches OEM dimensions precisely. The factory-applied adhesive backing holds the gasket in position during reinstallation, making this a straightforward task for any RV owner comfortable working on their roof.
14 x 14 in inner diameter and 17 x 17 in outer diameter match original Dometic spec exactly -- no trimming or modification needed.
Peel-and-stick backing holds the gasket in place during unit reinstallation, keeping it properly aligned without extra hardware.
Full 1-inch profile restores the original compression fit between the AC base pan and your roof, sealing out wind, rain, and insects.
Confirmed fitment across 13 Dometic air conditioner model numbers -- covers most Penguin and Brisk Air units built for 14 x 14 openings.
Remove the rooftop AC unit following Dometic's standard procedure (typically 4 bolts through the ceiling assembly). Peel away the old gasket material from both the roof decking and the AC base pan, cleaning both surfaces. Peel the backing from the new gasket, center it over the vent opening, and press firmly. Reinstall the AC unit and torque the mounting bolts evenly to avoid uneven gasket compression.
Even if your current gasket shows no active leaks, inspect it any time you do a roof walk-around. Styrofoam gaskets typically show meaningful compression after 3-5 years in full-time or warm-climate use. Replacing it proactively costs far less than repairing water-damaged ceiling panels or decking.