Direct: (503) 987-4002
Main: (503) 987-4000





The Capper Lift & Seal Kit is the perfect solution for creating a flush, level, and weather-tight bed rail when installing STAPLL Fender Rack Brackets with tonneau covers or bed cappers. Designed for truck beds up to 7 feet long, this kit fills the gaps between your brackets and bed rails, ensuring a stable mounting surface and a clean, professional finish.
Whether you’re building an overland setup or upgrading your work truck, this kit helps eliminate uneven mounting surfaces while improving sealing and protection from the elements. The included rubber rolls and butyl seal rubber create a durable, weather-resistant barrier that keeps dust and moisture out, while also enhancing overall stability.
Installation is straightforward and can be completed with basic tools, making it an easy DIY upgrade. With custom-cut lengths, you can dial in the perfect fit for your specific configuration. Built to handle tough conditions and long-term use, the Capper Lift & Seal Kit makes integrating your brackets with other truck accessories simple, secure, and reliable.
We ship nationwide and internationally. Most in-stock items leave our shop within 1–3 business days. Made-to-order and oversized parts may require additional lead time; any special timing will be noted on the product page.
If an order is placed outside of our normal business hours (Monday–Friday), we will process it as soon as possible once our team is back in the shop during regular operating hours. Weekend orders will be handled the next business day.
We want you stoked on your gear. Eligible items may be returned within 30 days of delivery for a refund or exchange.
Many products include a manufacturer warranty. We’re happy to help facilitate claims—reach out with your order number, photos, and a description of the issue.
Questions about shipping or returns? Get in touch—our team is here to help you get trail-ready.
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