ESI Front Rail Seal XL for Truck Cap, Camper Shell, Topper EPDM Rubber Fills a Height Gap of .488" to 1"

ESI Front Rail Seal XL for Truck Cap, Camper Shell, Topper EPDM Rubber Measures 1" width x 1.125" height, 5 1/2ft length. Front Rail Seal XL adheres to the truck's front bulkhead rail. To seal the cap's side base rails install a high quality Extruded Solutions (ESI) Truck Cap Seal 20ft. To determine if you need a Front Rail Seal measure the difference in height from the truck's side bed rails (including, if any, bed rail caps) to the truck's front bed rail. For the cap's side base rails (when using a Front Rail Seal XL) install one of ESI's quality 20ft truck cap seals. To seal the cap's front and side base rails (not using a Front Rail Seal) install one of the following 20ft or 23ft length ESI truck cap seals: 1 1/2" wide Super Cap Seal 23ft or Super Cap Seal 20ft fills all bed rail gaps, use on truck caps that weigh 200 lbs or less. 2" wide Premium Cap Seal XL 23ft or Premium Cap Seal XL 20ft fills small to medium bed rail gaps, use on truck caps that weigh 200 lbs or less. 2 1/8" wide Super Cap Seal XL 23ft or Super Cap Seal XL 20ft for trucks with extra wide bed rails, fills all bed rail gaps, use on truck caps that weigh over 200 lbs. 1 1/2" wide Ultra Cap Seal 23ft or Ultra Cap Seal 20ft fills all bed rail gaps, for truck caps that weigh over 200 lbs. IMPORTANT: To completely seal out the elements that enter in through the tailgate gap and sidewalls install an Ultimate Tailgate Seal with Taper Seal?. MADE IN AMERICA