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- GROSS MECHANICAL HFB, GROHFB
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Features improved valve system requiring less water per flush which makes it ideal for boats using holding tanks and easier pumping and no recirculation. Long stroke piston type pump for smooth, dependable operation. Adaptable for left hand operation. 90 degree discharge. Adapts to Groco ZD system or any other supplemental treatment or retention system. Installs above or below water line.