Oatey No-Calk rain collar for 2" vent pipes. Flexible rubber collar has an actual 1-5/8" opening and stretches to accommodate up to 2" standard size 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.