20" 40 Lbs 178 N Gas Spring Struts Prop Shock for Tonneau

Aeagle 20" 40 lb gas strut pair provides smooth, controlled lifting and support for tonneau covers, RV doors, camper shells, toolbox lids and other heavy box lids without brackets.

These replacement gas springs are built to deliver 178 N (40 lb) of lift force apiece with a 19.7" (500 mm) extended length and 11.8" (300 mm) compressed length. Designed as a direct fit for part numbers C16-08316 and C1608316, the pair is ideal when your original struts have lost pressure or failed. The set is sold as two struts and does not include mounting brackets or ball-stud hardware — choose matching brackets if your application requires them.

How do these gas struts improve opening and closing of heavy lids?

These gas springs reduce the effort required to lift and hold lids, providing consistent counterbalance and dampened motion so lids open smoothly and stay open without slamming. They are nitrogen-charged for stable force through the stroke and designed to resist sudden drops.

• 178 N (40 lb) support per strut for lids roughly 32–44 lbs
• Gas-damped motion prevents abrupt closures and wear
• Precise extended/compressed lengths (19.7"/11.8") for accurate fitment
• Sold as a pair to replace both sides at once for balanced operation

Will these fit my tonneau cover, toolbox, or RV door?

They are universal heavy-duty struts intended for many lids and panels including tonneau covers, RV side doors, camper shell rear windows, truck caps and toolbox lids. Check the lid weight and measure current strut lengths to confirm compatibility before purchasing.

• Best for lids weighing between 32 and 44 lbs (14.5–20 kg)
• Extended length 500 mm, compressed 300 mm — match your current strut
• Replaces part numbers C16-08316 and C1608316 for direct swap
• No brackets included — use existing mounting hardware or buy separately

How easy is installation and what tools do I need?

Installation is straightforward for most users: remove the old struts, align the new unit at the same orientation, and snap on compatible ball-stud fittings or secure with bracket hardware. Because the struts are gas-pressurized, they cannot be fully compressed by hand; take care when positioning the lid or use a prop while installing.

• Simple snap-on or bolt-on installation when using compatible ball studs/brackets
• Use a prop or helper to support lid during replacement (struts are pressurized)
• Standard hand tools (wrenches, pliers) typically suffice
• Check orientation arrow or cylinder side for correct installed direction

What warranty and support come with the struts?

Aeagle backs these gas springs with a 12-month warranty to cover manufacturing defects and premature failures under normal use. Customer support is available to answer fitment questions or help troubleshoot installations.

• 12-month limited warranty from Aeagle
• Contact support for fitment guidance or replacement assistance
• Sold as a quantity of two — replace both sides for balanced performance
• No brackets included; check your mounting hardware before ordering

Who is this for: These Aeagle 20" 40 lb gas struts are for vehicle owners, RV and camper renovators, trailer technicians, and DIYers who need a dependable replacement for worn-out lid supports. They suit anyone replacing a set marked C16-08316 / C1608316 or anyone who measured a lid weight near 32–44 lbs and needs stable, dampened lift without swapping mounting systems.