The Marsh Brothers Aerostar Accumulator upgrade kit offers Aerostar owners an option to upgrade the hydraulic accumulator with a non-metallic piston and improved dynamic seals. The non-metallic piston made from AeroTough GF polymer will eliminate any chance of scratching the cylinder bore during normal operation. The improved dynamic seal made from Thorseal material, will remain stable over a wide range of operating temperatures and will not swell, shrink or bind.