---
product_id: 19271969
title: "ESI Super Cap Seal XL 20 FT (2 1/8\" Width x 1/2\" Height x 20' Length) EPDM Rubber for Caps Over 200 lbs"
brand: "esi"
price: "384.87 DT"
currency: TND
in_stock: true
reviews_count: 10
category: "Esi"
url: https://www.desertcart.tn/products/19271969-esi-super-cap-seal-xl-20-ft-2-1-8
store_origin: TN
region: Tunisia
---

# 20 ft length for extra-wide truck beds Durable EPDM rubber resists compression & vibration Proudly made in USA for trusted quality ESI Super Cap Seal XL 20 FT (2 1/8" Width x 1/2" Height x 20' Length) EPDM Rubber for Caps Over 200 lbs

**Brand:** esi
**Price:** 384.87 DT
**Availability:** ✅ In Stock

## Summary

> 🚛 Seal the deal with the ultimate truck cap protection!

## Quick Answers

- **What is this?** ESI Super Cap Seal XL 20 FT (2 1/8" Width x 1/2" Height x 20' Length) EPDM Rubber for Caps Over 200 lbs by esi
- **How much does it cost?** 384.87 DT with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/19271969-esi-super-cap-seal-xl-20-ft-2-1-8)

## Best For

- esi enthusiasts

## Why This Product

- Trusted esi brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Long-Term Reliability:** No need to replace seal every time you remove your cap—built for lasting service
- • **Custom Fit Flexibility:** Easily trims to size for perfect fit on extra-wide bed rails
- • **Complete Installation Kit:** Includes seal, butyl tape, alcohol pads & instructions for hassle-free setup
- • **Superior Material Performance:** Automotive-grade EPDM rubber outlasts PVC/foam seals with excellent compression set resistance
- • **Engineered for Heavy-Duty Caps:** Supports truck caps over 200 lbs with ease

## Overview

The ESI Super Cap Seal XL is a 20-foot long, 2 1/8" wide, 1/2" thick EPDM rubber seal designed specifically for mounting heavy truck caps and camper shells over 200 lbs on extra-wide bed rails. Made in the USA, it offers superior compression resistance and vibration absorption, comes with a complete installation kit, and is preferred by professional installers for its durability and long-lasting performance.

## Description

For 8 ft beds and truck caps that require more than 20ft of seal use Super Cap Seal XL 23ft, search ASIN: B00BNGBXOC. Easily trims to size to fit trucks with smaller width front bed rails. NOTE: To determine if you need to use a Front Rail Seal 6ft, 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. If the height of the gap is .250" or less install Super Cap Seal XL only. If the height of the gap is from .251" to .487" install Front Rail Seal on the cap's front base rail and install Super Cap Seal XL 20ft on the cap's side base rails. If the height of the gap is extra-large, from .488" to .875" install Super Cap Seal XL 20ft or 23ft on the cap's front and side base rails and install Front Rail Seal XL on the truck's front bed rail. Made in USA

Review: BUY THIS!!! This seal is tighter than a bull's butt in fly season. - I have had enough of the flimsy foam tape "seals." I have a heavy fiberclass high top type of cap, and have never had as water tight a seal as this. I live in the Land of Filtered Light with plenty of rain and snow. When I installed this, I adhered it to the bed rail instead of the cap and used the supplied putty to seal the corners. I know this sounds wrong, but a few weeks after I installed it I was in an accident and the shop had to remove the cap and truck bed. I told the shop to order another one of these seals, but in the end it was not needed. The seal was still good and the cap has not leaked since. I also love the design of this. The three rubber ridges create two channels between the outside of the cap and the inside. If any water were to make it through the first ridge, it gets channeled away. If it makes it through the second ridge--unlikely--there is another channel before the third ridge. Great design!
Review: Great seal! - This is a thick, wide, quality seal. My old seal was so cheap and smashed. Installed this one and still had some left over. Installed on Leer Topper on 2021 Toyota Tacoma 5ft bed.

## Features

- 20ft for mounting a truck cap or camper shell on a truck with extra wide bed rails and that weighs over 200 lbs. For 8 ft beds purchase ASIN: B00BNGBXOC
- Fills all bed rail gaps. Complete kit includes seal, butyl tape, alcohol pads and detailed instructions.
- High quality, long-lasting automotive grade EPDM rubber. Preferred by professional installers over PVC/foam seals.
- Excellent compression set resistance for maximum service life and vibration absorption
- No need to replace this seal every time your cap is removed. MADE IN USA

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00NCCNUJQ |
| Best Sellers Rank | #29,229 in Automotive ( See Top 100 in Automotive ) #61 in Automotive Weather Stripping |
| Color | Black |
| Customer Reviews | 4.4 out of 5 stars 475 Reviews |
| Item Dimensions L x W | 2.13"L x 2.13"W |
| Item Thickness | 0.5 Inches |
| Item Weight | 1.1 Pounds |
| Manufacturer | Extruded Solutions |
| Manufacturer Part Number | SCSXL-20R |
| Manufacturer Warranty Description | WARRANTY: Extruded Solutions, Inc. |
| Material | Ethylene Propylene Diene Monomer Rubber |
| Material Type | Ethylene Propylene Diene Monomer Rubber |
| Model Number | SCSXL-20R |
| Number of Items | 1 |
| Product Dimensions | 2.13"L x 2.13"W |
| Recommended Uses For Product | Truck |
| UPC | 855433005364 |
| Unit Count | 20.0 Feet |

## Product Details

- **Material:** Ethylene Propylene Diene Monomer Rubber
- **Color:** Black
- **Product Dimensions:** 2.13"L x 2.13"W
- **Item Thickness:** 0.5 Inches
- **Recommended Uses For Product:** Truck

## Images

![ESI Super Cap Seal XL 20 FT (2 1/8" Width x 1/2" Height x 20' Length) EPDM Rubber for Caps Over 200 lbs - Image 1](https://m.media-amazon.com/images/I/71fMElmzInL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ BUY THIS!!! This seal is tighter than a bull's butt in fly season.
*by T***R on February 14, 2026*

I have had enough of the flimsy foam tape "seals." I have a heavy fiberclass high top type of cap, and have never had as water tight a seal as this. I live in the Land of Filtered Light with plenty of rain and snow. When I installed this, I adhered it to the bed rail instead of the cap and used the supplied putty to seal the corners. I know this sounds wrong, but a few weeks after I installed it I was in an accident and the shop had to remove the cap and truck bed. I told the shop to order another one of these seals, but in the end it was not needed. The seal was still good and the cap has not leaked since. I also love the design of this. The three rubber ridges create two channels between the outside of the cap and the inside. If any water were to make it through the first ridge, it gets channeled away. If it makes it through the second ridge--unlikely--there is another channel before the third ridge. Great design!

### ⭐⭐⭐⭐⭐ Great seal!
*by M***E on July 21, 2025*

This is a thick, wide, quality seal. My old seal was so cheap and smashed. Installed this one and still had some left over. Installed on Leer Topper on 2021 Toyota Tacoma 5ft bed.

### ⭐⭐⭐⭐ Seals out moisture
*by V***E on January 10, 2026*

Does the job. Stays sealed. Soft and compressed in place. Does not noticeably raise the bed cover. Not really reusable.

## Frequently Bought Together

- ESI Super Cap Seal XL 20 FT (2 1/8" Width x 1/2" Height x 20' Length) EPDM Rubber for Caps Over 200 lbs
- ESI Front Rail Seal XL 5 1/2' EPDM Rubber for Truck Caps—Fills a Height Gap from .488" to 1"
- ESI Front Rail Seal 6ft EPDM Rubber

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*Product available on Desertcart Tunisia*
*Store origin: TN*
*Last updated: 2026-06-03*