In comparison to standard twin-tube shock absorbers, the Seastar Gas shock absorber has extra performance advantages that can instantaneously, automatically respond to your performance needs, and never fades due to aeration. The Seastar Gas-a-just is available in a monotube replacement and a performance enhancement for OE twin tubes. The Seastar Gas-a-just has two working chambers: An air-free hydraulic piston and valve area for responsiveness and control and a second high-pressure nitrogen gas region with a floating piston for a pleasant ride while driving and quick performance on demand. Gas shocks are energy storage elements that are hydro-pneumatic. Nitrogen gas and oil serve as compressible and damping (motion control) mediums. Key Features: It's ideal for controlling the movement of your lid, door, or cover. This gas shock with complete self-adjustment reduces bouncing and sway. A patented O-ring design distinguishes this splitting piston. Nitrogen (N2) gas maintains consistent pressure in the all-weather fluid. Consistent control regardless of the situation because the all-weather fluid is still there. Viscosity is nearly constant. A system with a high pressure that inhibits foaming and aeration. Product Details: SKU: GS62690 UPC: 808282134303 Weight: 0.37 LBS Extended Length (Inches): 15 OEM Number: GSNI-5150-30 Rated (Lbs): 30 Compressed Length (Inches): 9.5 Marine Grade Gas Filled Supports Annealed steel rods, nitride coated for corrosion resistance Engineered polymer rod ends Bronze bushings Multi-lobe internal seal Exact fit OEM replacement