{"product_id":"esi-super-cap-seal-xl-truck-cap-seal-20-ft-2-1-8-x-1-2-epdm-for-extra-wide-rails-heavy-cap-vibration-damping","title":"ESI Super Cap Seal XL truck cap seal 20 ft — 2 1\/8\" x 1\/2\" EPDM for extra-wide rails, heavy-cap vibration damping","description":"\u003cp\u003e\u003cstrong\u003eESI Super Cap Seal XL is a heavy-duty 20-foot EPDM rubber seal specially shaped to mount truck caps or camper shells with extra-wide bed rails and weights over 200 lb.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis full-length seal is engineered for long-term automotive use, providing a durable, vibration-damping barrier between your truck bed rails and a bulky cap or shell. The kit arrives ready to install with adhesive butyl tape, alcohol prep wipes, and step-by-step instructions so you can fit a secure gasket without scavenging parts. Made in the USA from automotive-grade EPDM, the material resists compression set and stays flexible through temperature swings better than ordinary foam or PVC alternatives.\u003c\/p\u003e\n\n\u003ch3\u003eHow will the Super Cap Seal XL fit my extra-wide bed rails?\u003c\/h3\u003e\n\u003cp\u003eThe profile measures 2 1\/8 inches wide by 1\/2 inch high and comes as a continuous 20-foot length designed for full 8-foot bed coverage for wider rails and heavier caps. Because the seal is larger than standard seals, it fills oversized gaps and creates a consistent contact surface along the entire rail.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDimensions: 2 1\/8\" width × 1\/2\" height × 20' length\u003c\/li\u003e\n  \u003cli\u003eExtra capacity to accommodate rails and boots wider than stock seals\u003c\/li\u003e\n  \u003cli\u003eContinuous length avoids seams across the bed rail\u003c\/li\u003e\n  \u003cli\u003eTrim or overlap for short beds when necessary\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat makes EPDM better than foam or PVC seals for heavy caps?\u003c\/h3\u003e\n\u003cp\u003eAutomotive-grade EPDM offers superior elasticity and long-term recovery after compression, so the seal maintains contact without permanently flattening. It also excels at damping vibrations from a heavy cap, reducing rattles and movement while driving.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eHigh compression-set resistance for longer sealing life\u003c\/li\u003e\n  \u003cli\u003eFlexible across hot and cold temperatures without cracking\u003c\/li\u003e\n  \u003cli\u003eDurable against repeated cap removal and reinstallation\u003c\/li\u003e\n  \u003cli\u003ePreferred by installers for professional-grade performance\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow easy is the Super Cap Seal XL to install and maintain?\u003c\/h3\u003e\n\u003cp\u003eInstallation requires no special tools: clean the rail, apply the included butyl tape, and press the EPDM gasket into place following the supplied instructions. The seal won’t need replacement each time you remove the cap, so routine maintenance is minimal—periodic inspection and cleaning are usually sufficient.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eIncludes butyl adhesive tape and alcohol pads for prep\u003c\/li\u003e\n  \u003cli\u003eStep-by-step printed instructions for straightforward fitment\u003c\/li\u003e\n  \u003cli\u003eReusable between cap installations when handled properly\u003c\/li\u003e\n  \u003cli\u003eSimple trimming if a slightly shorter length is required\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill this seal work for caps over 200 pounds?\u003c\/h3\u003e\n\u003cp\u003eYes — the XL profile and robust EPDM compound were selected to support heavier caps and camper shells by providing a stable, compressive interface. The material’s resilience helps distribute loads while maintaining a weather-resistant barrier.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDesigned specifically with heavy caps and shells in mind\u003c\/li\u003e\n  \u003cli\u003eAbsorbs vibration to minimize wear and noise\u003c\/li\u003e\n  \u003cli\u003eMaintains a consistent seal under significant weight\u003c\/li\u003e\n  \u003cli\u003eQuality construction intended for professional installation use\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho this is for: The ESI Super Cap Seal XL is aimed at truck owners and professional installers who mount larger-than-stock caps or camper shells that exceed 200 pounds on extra-wide bed rails. It’s ideal if you want a durable, low-maintenance gasket that holds up to repeated use, harsh weather, and the stresses of a heavy topper—without the quick deterioration common to foam or PVC seals.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I shorten the 20 foot seal for a shorter bed?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. The EPDM strip can be trimmed with a sharp blade for shorter beds; ensure clean cuts and proper end sealing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Is adhesive included for installation?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. The kit includes butyl adhesive tape plus alcohol prep wipes and printed instructions for installation.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Redleaf Auto","offers":[{"title":"Default Title","offer_id":67587528097977,"sku":"B00NCCNUJQ","price":104.59,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0822\/3765\/3177\/files\/esi-super-cap-seal-xl-front-packaging_bb7a514b-092f-4989-a808-f8e33f27c000.jpg?v=1790512011","url":"https:\/\/redleafauto.ca\/products\/esi-super-cap-seal-xl-truck-cap-seal-20-ft-2-1-8-x-1-2-epdm-for-extra-wide-rails-heavy-cap-vibration-damping","provider":"Redleaf Auto","version":"1.0","type":"link"}