{"product_id":"esi-super-cap-seal-xl-20-ft-epdm-rubber-seal-heavy-cap-fit","title":"ESI Super Cap Seal XL 20 ft EPDM Rubber Seal - Heavy Cap Fit","description":"\u003cp\u003eOur review of the ESI Super Cap Seal XL 20 ft finds it best for truck owners mounting a heavy camper shell or cap that weighs over 200 lbs and has extra wide bed rails. The biggest reason to buy is its automotive grade EPDM construction that resists compression set and vibration over repeated installs, so the seal stays serviceable even when the cap is removed periodically. Installation is straightforward and the kit includes butyl tape and alcohol pads, making it a practical choice for professional installers and DIYers who need a durable weather seal.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e20 ft length:\u003c\/strong\u003e Provides enough material to seal long side base rails on wide truck beds without splicing for most installations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEPDM rubber construction:\u003c\/strong\u003e Delivers long-lasting resistance to weathering, ozone and repeated compression for extended service life.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComplete installation kit:\u003c\/strong\u003e Includes butyl tape, alcohol pads and detailed instructions so the seal can be installed cleanly and quickly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDesigned for heavy caps:\u003c\/strong\u003e Sized specifically for mounting caps or camper shells over 200 lbs to ensure a secure, vibration-damping interface.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTrim-to-fit:\u003c\/strong\u003e Can be trimmed to smaller front rail widths for a clean fit on nonstandard rails.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho It's For\u003c\/h2\u003e\u003cp\u003eThis seal is aimed at truck owners who fit a midsize to heavy camper shell or cap and have wide bed rails where a standard seal would be too narrow. It is especially useful for professional installers and owners who remove and refit the cap occasionally, since the EPDM resists permanent set and keeps sealing reliably.\u003c\/p\u003e\u003cp\u003eThose who should look elsewhere include owners with very small gaps under.250 in who need only a thin front rail gasket, or buyers who require a shorter overall length for an 8 ft bed without trimming; there is a longer 23 ft option recommended in the product notes when more material is needed.\u003c\/p\u003e\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eDurable EPDM material offers superior compression resistance and vibration absorption.\u003c\/li\u003e\n\u003cli\u003eKit includes adhesive butyl and prep pads for an easier, cleaner installation.\u003c\/li\u003e\n\u003cli\u003eLong 20 ft length covers wide side rails and can be trimmed to fit smaller widths.\u003c\/li\u003e\n\u003cli\u003ePreferred by professional installers over PVC or foam alternatives for longevity.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eSome users report mixed adhesive performance, so extra care or supplemental adhesive may be needed in some installations.\u003c\/li\u003e\n\u003cli\u003eThe 20 ft length may be more than required for shorter beds unless trimmed, creating extra waste if not needed.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eAutomotive grade EPDM rubber\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLength\u003c\/td\u003e\n\u003ctd\u003e20 ft\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProfile size\u003c\/td\u003e\n\u003ctd\u003e2 1\/8 in width x 1\/2 in height\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIntended cap weight\u003c\/td\u003e\n\u003ctd\u003eFor caps over 200 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncludes\u003c\/td\u003e\n\u003ctd\u003eSeal, butyl tape, alcohol pads, instructions\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMade in\u003c\/td\u003e\n\u003ctd\u003eUSA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eOur Verdict\u003c\/h2\u003e\u003cp\u003eThe ESI Super Cap Seal XL 20 ft is a practical, long-lasting choice for owners fitting heavy caps on wide rails; its EPDM construction and included kit make installation easier and the seal more durable than foam alternatives. It represents good value for those who need reliable compression resistance and plan to remove and refit the cap periodically.\u003c\/p\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eCan I trim this seal to fit narrower rails?\u003c\/strong\u003e\u003cbr\u003eYes. The seal trims easily to fit smaller width front bed rails.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this seal suitable if my cap weighs under 200 lbs?\u003c\/strong\u003e\u003cbr\u003eIt will work but it is optimized for caps over 200 lbs; lighter caps may not require as robust a profile.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen do I need an additional front rail seal?\u003c\/strong\u003e\u003cbr\u003eIf the height gap at the front rail is.251 in to.487 in, install a Front Rail Seal on the front base rail in addition to this side rail seal.\u003c\/p\u003e","brand":"ESI","offers":[{"title":"Default Title","offer_id":48265007235291,"sku":"B00NCCNUJQ","price":35.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/71fMElmzInL._AC_SL1500.jpg?v=1778296043","url":"https:\/\/gearmusthave.com\/products\/esi-super-cap-seal-xl-20-ft-epdm-rubber-seal-heavy-cap-fit","provider":"GearMustHave","version":"1.0","type":"link"}