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WENCO Series 300 Thief Hatches have an 8-inch standard round base with
(16) 5/8" holes on a 10 3/8" bolt circle with an API bolting pattern. They offer
pressure and vacuum relief with a standard pressure setting from 4 oz. to 16
oz. and 4/10 oz. vacuum relief. In addition, each latch down hatch readily
operates as a vital mean of controlling vapor loss and tank protection while
providing convenient access to storage tanks for gauging and sampling.