DuraVent PelletVent Pro 4" diameter tee adaptor with increaser: The exterior is finished in black. Branch segment with a 3" inner diameter. It's ideal for bridging the gap between two PelletVent Pro pipes of different diameters. A venting pipe with a 4" inner diameter is required for this unit. This 4" diameter DuraVent PelletVent Pro tee adaptor with increaser is an essential part of your PelletVent Pro system. It has a 3" branch section with a 3" inner diameter. This component is ideal for transitioning between PelletVent Pro pipes of different diameters. You won't find better venting components than the ingenious folds at DuraVent if you're constructing a pellet stove. This system will provide a safe and long-lasting venting solution for your pellet stove.

DuraVent PelletVent Pro 4-inch diameter tee adaptor with increaser Black exterior finish 3-inch inner diameter branch section Great for transitioning between two different diameter of PelletVent Pro pipes