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Oatey No-Calk flexible rubber rain collar has (2) openings - one with an actual 1-3/8" opening stretches to accommodate pipes from 1-1/2" to 2" OD, and the other (accessible by removing inner ring with pliers) has an actual opening of 2-1/2" and acommodates standard size 3" vent/exhaust/flue pipe, including PVC, ABS, no-hub cast iron, Centrotherm Innoflue SW (Single Wall) and others. No-Calk design creates a watertight seal, requires no sealant and is UV-resistant. Can be slid over the existing vent/exhaust pipe as a secondary seal or to fix water leaks resulting from worn-out, deteriorating, damaged or cracked existing rain collar.