This Old House general contractor Tom Silva shows how to create a watertight seal around a vent pipe. (See below for a shopping list and tools.)
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Shopping List for How to Fix a Leaking Rooftop Vent Pipe:
replacement rubber gasket [https://amzn.to/2NTqPXe], for installation over existing, leaking gasket
lapseal caulk [https://amzn.to/2NTYobz]

Tools for How to Fix a Leaking Rooftop Vent Pipe:
pocketknife [https://amzn.to/34AgDZI]
caulk gun [https://amzn.to/2Lorz4S]

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How to Fix a Leaking Rooftop Vent Pipe | This Old House
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