Retrax RetraxPRO MX - 19-26 Sierra (w/ CarbonPro Bed) 5'9" w/o Stk Pkt - Std Rail 80488 2008-2010 Ford F-450 6.4L By changing the block off

By changing the block off plates you can adjust the SPL (Sound Pressure Level) to your taste

creating a more controlled and predictable driving experience whether the truck is pulling a trailer or putting power to the ground

Able To Be Reused With each Filter Change

000 psi tensile strength for extreme durability

Fits 1955-1957 Chevrolet full-size models with bench seats using 451

Retrax RetraxPRO MX - 19-26 Sierra (w/ CarbonPro Bed) 5'9" w/o Stk Pkt - Std Rail 80488 2008-2010 Ford F-450 6.4L By changing the block offRetraxPRO MX Retractable Tonneau Cover Rugged Aluminum Construction Matte Black 2019 2026 GMC Sierra (with CarbonPro Bed) 5' 9" Bed without Stake Pockets Standard Rails Over one million sold worldwidenow even better Double wall aluminum slat construction supports up to 500 lbs CoreTrax sealed rollers deliver smooth, reliable operation Key lockable TraxLatch handle offers infinite locking positions Ultra secure design enhances theft resistance Opens