Free Access t-shirt with any Access Tonneau Cover. Access TrailSeal Tailgate Gasket. The perfect partner for your Access Tonneau Cover or any other brand of truck bed topper is Access'TrailSeal Tailgate Gasket. While your tonneau is hard at work keeping the deluge of nasty weather or swirling dust out of your payload, the TrailSeal seals your tailgate type for total element protection. In just a few minutes, the Access TrailSeal Tailgate Gasket can be trimmed to fit any truck and installed in place around the gate. It offers a firm cushion and tight seal every time you close your tailgate, blocking rain, snow and dirt from getting to your cargo. Easy installation instructions are included in the Access TrailSeal package. All you have to do is cut, peel the adhesive backing, and stick in place. It's the fastest way you can help protect your valuable cargo. Access TrailSeal Tailgate Gasket. Tonneau Covers, Tonneau Accessories.