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These reverse-purchase blocks allow you to move loaded line while keeping cylinder length as short as possible, saving weight and space. 

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Harken Hydraulics - Cylinder Rod Blocks

These reverse-purchase blocks allow you to move loaded line while keeping cylinder length as short as possible, saving weight and space. They can be used anywhere a reverse purchase is needed: cunninghams, stay deflectors, travelers, and athwartship jib systems. Blocks are rigid when mounted to the rod. They are available in single, single with becket, and double versions for reverse purchases from 1:2 to 1:4.

MAURIPRO Sailing, your direct access to Hydraulic Cylinder Rod End Blocks and all your other sailing and boating needs.