Cim-Tek Vapor Control Pre-Vent Cap Description The Cim-Tek Pre-Vent Cap is a simple, effective solution for minimizing evaporation and maintaining fuel quality in aboveground storage tanks. Built with a durable cast-iron base, the Pre-Vent features an integrated pressure and vacuum release system that helps stabilize internal tank pressure. It is also designed to divert rain and condensation away from the fill hole to protect the fuel's integrity. By minimizing fuel vapor loss, the Pre-Vent not only supports fuel conservation but also aligns with today's environmental standards, making it an essential component for any fuel storage setup and a trusted product for environmentally-focused fuel facilities. NOTE: Not for use with aviation fuel. Features Pressure cap valve opens at 1.25 lbs cracking pressure while the vacuum release opens at 0 to .5 ounces when the tank cools Helps maintain fuel quality by reducing condensation and evaporation loss Designed to divert rain and condensation away from the fill hole Limits the release of vapors that escape into the atmosphere protecting the environment Applications 2" NPT tank opening Small aboveground farms Commercial gasoline and distillates Fuel transfers Small oil storage tanks Industrial oil transfer tanks
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