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Selkirk Metalbestos Selkirk 104800 Gas Vent, 4" Cap Bird Proof Type B Top Round, 4 Inch, Galvanized - Roof Vents - Amazon.com
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Selkirk 4-in x 8-in Galvanized Steel/Aluminum Cap for Natural Gas Venting - UL Listed, 15-Year Warranty in the Galvanized Pipe & Fittings department at Lowes.com
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