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Pre-Vent Vapor Control Six Pack. Cast-Iron base w/ plated cap featuring security anti-theft arm. Allows up to 30 GPM Fluid Removal. Pressure Cap Valve Opens at 2.5 lbs to Reduce Pressure, While the Vacuum Release Opens at 1.5 Oz. when the Tank Closes. Designed for 2" NPT Tank Opening. Helps Maintain Fuel Quality by Reducing Evaporation and Condensation Loss. Designed to Divert Rain and Condensation Away from Fill Hole. Limits the Release of Vapors that Escape into the Atmosphere, Protecting the Environment