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Oatey No-Calk rain collar for 2" vent pipes. Flexible rubber collar has an actual 2-1/2" opening and stretches to accommodate up to 3" standard size vent/exhaust/flue pipe, including B-Vent, 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.