Smooth Double Pipe Blocks

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Smooth Double Pipe Blocks provide a professional, weatherproof solution for sealing dual pipe penetrations through exterior siding, particularly fiber cement. Engineered specifical ly for natural gas furnace intake and exhaust pipes, these blocks create a secure, airtight mount (when caulked accordingly)that prevents water infiltration and air leakage around pipe entries. The smooth finish integrates seamlessly with siding while maintaining structural integrity and energy efficiency at critical building envelope points. Show more