Sea-Dog Gas Filled Lift Spring - 20" - 120#

The Sea-Dog Gas Filled Lift Spring – 20" – 120# is a marine-grade pneumatic support strut designed for hood, tonneau cover, and cargo door applications on trucks, RVs, and marine vessels. This pressurized gas spring provides smooth, controlled lifting assistance while reducing manual effort and wear on hinges and latches. Sea-Dog manufactures to OE marine standards, making this strut a reliable replacement or upgrade for any vehicle owner seeking improved hatch and door operation without the complexity of mechanical linkages.

Gas springs work by using a sealed, nitrogen-pressurized cylinder to create consistent upward force throughout the stroke. The 20-inch length and 120-pound force rating make this unit ideal for mid-sized hatches and covers where balance is critical—strong enough to hold weight without slamming, yet responsive enough to assist opening with minimal push. The sealed design eliminates rod corrosion and oil leakage common in older hydraulic struts, and the robust construction withstands salt spray, UV exposure, and temperature extremes typical in marine and outdoor environments.

Mechanics and truck builders favor Sea-Dog struts for tonneau and truck bed covers, RV cargo doors, and marine hatch replacement. Installation requires basic fastener work—typically ball-stud or clevis mounts at each end—and no tools beyond a socket set and wrench. A 2-year warranty covers manufacturing defects, and the proven track record across thousands of marine and RV applications ensures long-term durability. Whether upgrading an older rig with worn-out hinges or building a custom truck bed cover system, this gas spring delivers quiet, maintenance-free operation for years.