Gas Filled Lift Spring – 20” – 60# – Sea-Dog Gas Springs and hardware are manufactured to marine OE standards and have been installed in marine and RV applications for several years. Sea-Dog Gas Springs are the ideal choice for all marine, RV, truck cap, tool box, and utility applications because of their unique multi-lobe seal which offers superior service life and performance. Hard chromium plated shafts, bronze bushings, and polymer end fittings mean you are buying THE BEST. – Other applications for Sea-Dog Gas Springs: Hatches, doors, tool boxes, farm machinery, golf carts, luggage doors, engine hatches, canopies, access hatches, seating, RV doors, furniture, truck caps, and utility boxes. Accepts 10 mm ball.