1998 - Volume #22, Issue #4, Page #7
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Water-Powered Gate Opener
You can use water pressure from your farm or house to power this automatic gate opener that installs under the ground.
It consists of a hydraulic unit inside a box and a latch mechanism. No electricity is required. A pressure relief valve allows the gate to be manually opened or closed in case the water pressure ..........


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1998 - Volume #22, Issue #4