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There is a plastic boot with a rubber piece that surrounds the pipe for this. If it's an existing installation you won't be able to do this unless you have utility power disconnected. However, you can get some flashing and tar and seal the leak by installing the flashing under the shingles with liberal amounts of tar, and sealing the upper part of the flashing to the mast with tar as well. If you don't know how to install flashing, a simple Google search or talk with someone at Home Depot should get you started.

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Q: How do you prevent rain from entering at the top of the mast?
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