The DuraVent 3PVP-ADHB is a harman adapter from the PelletVent Pro collection, a vent system that is designed for stoves and inserts that are using oil fuel and wood pellets. This harman adapter is designed to be used in providing a tight and secure fit to the exhaust outlet on any Harman Pellet Stove. It is also sealed with high temperature silicone sealant for a secure connection. This measures 3 inches in diameter and is covered by DuraVents limited lifetime warranty.Search only for the best and high-quality products for your vent and chimney system. In cooperation with DuraVent, PlumbersStock.com has everything you need at affordable prices. Go find yours now here at PlumbersStock.com!