Gas Filled Lift Spring – 20″ – 80 Sea-Dog Gas Springs and hardware are manufactured to marine OE standards and have been installed in marine and RV applications for several years. You can count on our high quality. 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.