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All Style Industries 1/2 inch Double All Style Small 2-Hole STD-Storm Collar Flashing; with Two (2) 1/2 in. Diameter Supply/Return Conduit Pipe Nipples in the Vent Pipe Flashing department at Lowes.com
All Style Industries Four Inch All Style Medium Standard STD-Storm collar Flashing for 4 inch Diameter (4-1/2 inch O.D.) Round Pipe in the Vent Pipe Flashing department at Lowes.com
All Style Retro-Split E.P.D.M. Rubber Storm Collar Flashing with a 0.840 in. O.D. Hole for 1/2 in. NPS Conduit Pipe 702840 - The Home Depot
Oatey® Rain Collar For No-Calk® Roof Flashings/Multi-size | Oatey
Commercial Retro-Split™ Storm Collars - All Style Industries
Flashing Collar | 10² Racing
Pipe Flashing, Storm Collars, Pipe Boots Waterproof any roof penetration