Goof Proof Shower Goof Proof Waterproofing Sheet Membrane Underlayment Flexible Pipe Collar 4.25 in. x 4.25 in. x 20mil GPFPC-Flexible Pipe Collar - The Home Depot
Sealing pipe collar Wiper Isol-One O | Wetrooms Design
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100 mm Internal Wall Sealing Collar : Regulus
DTW Storm collar (required only if roof flashing does not seal to pipe - Stovefitter's Warehouse