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Hook one end link of the chain to the carabiner.
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Hook the carabiner through the hole in the rudder of the decoy. The chain should hang down from the carabiner.
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Hook a second carabiner to the opposite end link of the dangling chain.
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Hold the carabiner and wrap it and the chain down around the irrigation pipe and back up to itself.
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Hook the carabiner back to one of the links in the chain so that the decoy can float buoyantly on the surface of the pond.