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 ball check prevents contamination of tank fluids by water during rough seas. A fine mesh flame screen protects tank gases from igniting when subject to a deck fire. The vent is available less a screen where a low pressure vertical ball check is the only requirement.

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