The Fox Factory suspension 20WT Gold fluid protects the fork effectively against wearing. It maintains seals, reduces frothing and provides optimal damping characteristics over a wide temperature range. Specification Viscosity: 20 Weight. Compatibility: Suspension Forks: for FIT and O/C damper cartridges (not for open bath fork dampers). Dust Wiper: for all 34, 36, 40 mm and low-friction wipers (Version 32 mm only compatible with Gold Dust Wiper Seal Kit).