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The Hydro-Guard® HG-3 Longneck Unit The Hydro-Guard® HG-3 Longneck Standard Unit provides the benefits of Automatic Flushing regardless of climactic conditions. The Unit's working components have been placed below the frost depth for year-round use in freezing climates. The Unit is available in 3-foot, 5-foot and 7-foot bury lengths. Custom depths are also available. Simply plug the 10 event hand-held programmer into a jack located under the cap, establish your flushing schedule and walk away. All mechanical components, though located below frost depth, may be easily accessed using a patented cam-lock release system. Click here to view installation rendering
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