Oatey Mushroom Vent Cap 4-in Dark Gray Round Cap in the Shower Drains department at Lowes.com
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NIBCO - 4 x 4 x 3", ABS Drain, Waste & Vent Pipe - 63272934 - MSC Industrial Supply
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METAL FAB Vent Pipe Elbow, 90 Degree: Stainless Steel/Aluminized Steel, For Use With 6FZN0 to 6FZN3 - 6XWP2|RTG20151GA - Grainger
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Perma-Boot Pipe Boot Repair for 3 in. I.D. Vent Pipe Black Color PBR 312-3BK - The Home Depot
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:max_bytes(150000):strip_icc()/venting-sink-toilet-bathtub-diagram-6fe98bed-a3fbe89aa95f45b0a98754e849ad13fa.jpg "Everything You Need to Know About Venting for Successful DIY Plumbing Work")