Wager's In-Line Valves protect tanks and bulkheads from pressure or vacuum buildup during loading or unloading of tanks, and are used in locations where operations require an in-the-line vent check valve rather than a terminal vent valve.

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The one-way ball check valve prevents the escape of tank fluids during rough seas. A fine-mesh flame screen provides protection against ignition of tank vapors in the event of a deck fire. For applications where flame protection is not required, the vent can be supplied without the screen, functioning solely as a low-pressure vertical ball check valve.

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