Why do people use these....
Yes, DPG, it protects the docks from ice damage due to the expansion of water as it freezes. This can be a tremendous force, especially when there are large expanses of ice. Piling and crib docks, which have their support left in the water over the winter, are particularly exposed. I had my bubbler shut down for 2 weeks last winter and lost 3 pilings - expensive!
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