Sea-Dog Gas Filled Lift Spring - 20" - 40#

The Sea-Dog Gas Filled Lift Spring – 20" – 40# is a precision gas-charged support component engineered for automotive, marine, and RV applications requiring controlled motion and sustained load support. This lift spring excels in hood prop systems, tonneau cover mechanisms, and equipment hatch assemblies where reliable, smooth operation is non-negotiable. Whether you're upgrading a truck bed cover, securing an engine compartment lid, or maintaining an RV access panel, this gas spring delivers predictable force control without the wear and maintenance headaches of mechanical springs.

Built to marine original equipment (OE) standards, this gas-filled lift spring operates using pressurized inert gas sealed within a precision cylinder, delivering a consistent 40-pound lifting force throughout its 20-inch stroke. The gas-charge design eliminates the coil spring's tendency to sag over time and provides a smoother, more controlled open and close cycle compared to traditional mechanical alternatives. At just 0.4 lbs, the compact design minimizes weight penalty while the robust construction withstands repeated cycling in harsh marine, automotive, and outdoor environments—backed by Sea-Dog's comprehensive 2-year warranty.

Mechanics and enthusiasts favor Sea-Dog gas springs for retrofit applications and OEM replacements on tonneau covers, truck caps, marine cabin doors, and RV storage compartments. The 40-pound force rating suits mid-weight applications; proper sizing ensures smooth assisted opening without over-extension. Installation requires mounting at both ends using standard ball-socket or clevis-pin connections—verify mounting points on your specific hood, hatch, or cover assembly before purchase. This lift spring pairs seamlessly with existing hardware or can anchor into universal mounting brackets available through automotive and marine supply channels.