EcoSynic 14" x 14" RV Air Conditioner Gasket — One-Piece Closed-Cell Seal Kit, Leak-Proof 17" x 17" Outer Frame

If your camper, trailer or van has an aging or cracked air conditioner gasket, moisture and drafts can follow—causing stains, insulation damage and inefficient cooling. This EcoSynic kit includes a single-piece gasket pad plus replacement strips sized to fit a 14" x 14" inner AC flange (17" x 17" outer frame), engineered as a direct, waterproof replacement for many rooftop units from brands like Dometic, Airxcel, Advent, Atwood and Coleman.

How does the one-piece design improve roof sealing compared with multi-part gaskets?

The single-piece gasket reduces seams and gaps that commonly form in four-piece kits, cutting the paths water and air use to enter the roof cavity. Its closed-cell foam resists compression set and holds a continuous seal under the air conditioner flange, limiting movement-induced leaks.

• Continuous foam layer minimizes seam leaks
• Closed-cell material repels moisture and resists absorption
• Stronger adhesive backing for consistent contact to roof surface
• Includes thin and thick gasket strips for customizing the seal

Will this gasket fit my RV air conditioner and how do I adapt it if needed?

The gasket’s inner opening measures 14" x 14" with an overall outer dimension of 17" x 17", covering the common footprint used by many rooftop AC units. The foam is easy to trim, and the kit supplies extra strips so you can correct for uneven roof surfaces, flange tolerances or to increase seal compression where needed.

• Inner size 14" x 14"; outer 17" x 17" for broad compatibility
• Cut-to-fit closed-cell foam for customized installation
• Thick and thin gasket strips included to build proper compression
• Works with popular OEMs like Dometic, Airxcel, Coleman and others

What installation steps and tools should I expect for a DIY replacement?

Installation is straightforward: remove the old gasket, clean the roof flange, position the new one-piece pad, and press the adhesive backing firmly. Fasten the AC unit per manufacturer torque specs; use the supplied strips where extra height or pressure is required to ensure an even seal.

• Remove old gasket and clean roof surface thoroughly
• Trim the foam if necessary to match your flange dimensions
• Peel adhesive backing, align and press to secure the gasket
• Add gasket strips under flange bolts to equalize pressure

Can the gasket pad do more than seal—like improve airflow management?

Yes. Besides sealing, the one-piece foam can be repurposed as a DIY airflow divider or foam block kit during installation. When combined with aluminum foil tape it helps route cold and return air more predictably, which can reduce short-cycling and improve perceived cooling performance.

• Use as foam blocks to maintain bolt tension on smooth roofs
• Combine with foil tape to create a custom air divider
• Helps separate supply and return air for better HVAC behavior
• Flexible enough to trim and shape for specific mounting needs

Who is this for: The EcoSynic 14" x 14" one-piece RV AC gasket kit is intended for RV owners, van lifers and trailer DIYers who need a dependable, weather-resistant replacement for an old or damaged rooftop air conditioner seal. It’s especially useful for anyone who prefers a fast peel-and-stick installation, wants fewer seams under the AC flange, or needs adaptable foam strips to address uneven roofs and improve unit stability. This kit ships with one gasket frame, one one-piece gasket pad, and two gasket strips (thick and thin), providing the parts required to restore a watertight, well-sealed rooftop AC installation.