ESI Ultimate Tailgate Seal for RAM with RamBox (2009–2023 Classic, 2019+ New) — EPDM Weather Seal with 3M Tape

ESI Ultimate Tailgate Seal is a patented EPDM rubber weather sealing kit designed to seal the tailgate bottom and sidewalls on RAM trucks with RamBox and compatible tonneau covers.

When you use a tonneau cover on RAM trucks with RamBox or standard tailgates, gaps at the tailgate bottom and sidewalls can allow dust and water to enter the bed. The ESI Ultimate Tailgate Seal was engineered specifically to address those entry points by mounting to the tailgate and adjacent surfaces using automotive-grade 3M ST1200 adhesive tape. Made in the USA and manufactured from durable EPDM rubber, this kit is tailored to the fit requirements of RAM's Classic body style (2009–2023) and the New body style (2019 and newer) that include RamBox options.

How does the seal prevent dust and water from entering the truck bed?

The ESI seal creates a continuous barrier along the tailgate bottom and sidewalls where a tonneau cover meets the tailgate. Its flexible EPDM material compresses to close gaps while resisting weathering and UV exposure. Proper adhesion with the included 3M tape ensures the seal remains tight under vibration and movement.

• EPDM rubber resists ozone, heat, and UV degradation.
• 3M ST1200 adhesive bonds to various finishes, including spray-in liners.
• Contoured profile follows tailgate and RamBox geometry for a snug fit.

Which RAM models and tailgate types is this kit compatible with?

This product fits RAM trucks equipped with RamBox in the Classic body style (model years 2009–2023) and the New body style from 2019 onward. It’s specifically designed for installations where a tonneau cover is used and addresses RamBox-related gaps. If your truck has a Multifunction tailgate, refer to the indicated ASIN for the correct version.

• Compatible: RAM with RamBox 2009–2023 Classic body style.
• Compatible: RAM with RamBox 2019+ New body style.
• Special versions available for Multifunction tailgate — check ASIN references.

What materials and installation requirements should I know before installing?

The seal uses automotive-grade EPDM rubber and 3M ST1200 pressure-sensitive adhesive tape designed to bond to painted surfaces and most bed liners. For a secure, long-lasting bond, the surfaces must be clean, dry, and within the recommended temperature range during application.

• Material: durable EPDM rubber for long-term weather resistance.
• Adhesive: 3M ST1200 tape—requires 25 lbs. of applied pressure to bond.
• Installation temp: apply between 55°F and 104°F (13°C–40°C).

What do I need to follow during installation to ensure proper performance?

Follow the included or online instructions step by step: clean mounting surfaces thoroughly, allow adhesive to warm to room temperature if needed, and apply firm pressure across the entire length of the tape. Take time to align the seal before final adhesion to avoid repositioning once the tape sets.

• Clean surfaces of dirt, oil, and residue before applying the seal.
• Apply consistent pressure (about 25 lbs.) along taped areas for proper bond.
• Install only within the recommended temperature range for optimal adhesion.

Who is this for? The ESI Ultimate Tailgate Seal is aimed at RAM owners who use a tonneau cover and need to block water, dust, and debris that enter through the tailgate bottom and sidewalls—especially those with RamBox-equipped trucks in the specified model years. It’s also suitable for vehicle owners who want an OEM-compatible, weatherproofing upgrade made from long-lasting EPDM with a reliable 3M adhesive backing. If you have a Multifunction tailgate or a non-RamBox model, verify the correct part ASIN before purchasing to ensure fitment.