Gas Filled Lift Spring - 20" - 40# 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 and a 2-year warranty on all Sea-Dog® Gas Springs. 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.WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.