DuraVent Type B Gas Vent Storm Collar - For Vent Pipes with a 3" Diameter - 3GVSC: A venting pipe with a 3" inner diameter is required for this unit. This DuraVent Type B gas vent storm collar is required if you are using DuraVent Type B gas vent systems with a 3" diameter and want to properly seal and complete the venting job. It creates a firm barrier between the pipe and the flashing, preventing rainfall from entering your pipe and venting system, and therefore your chimney, causing damage to your fireplace's venting system. By preventing potential water damage with a proper seal, this small accessory serves such an important role in the long-term protection of your vent system.

Creates weather-resistant seal between vent piping and flashing For use with 3" Dura-Vent Type B Gas Vent pipes 25-year warranty