Sentry Sprinklers Model ARV-2000 is an Air Release Valve that releases accumulated air in a wet pipe system without pressure loss. The valve must be installed in the vertical position at the highest point in the piping system. The valve is anti-corrosion with 10 mil (250μ) of fusion-bonded epoxy (FBE) coating on both the inside & outside. All other components are made of corrosive resistance materials.