DuraVent PelletVent Pro Galvalume 3" to 4" Increaser- Appliance Adaptor - 3PVP-X4AD: A venting pipe with a 3" inner diameter is required for this unit. Dura Vent's 3"-4" increaser connects 4" vent pipes to 3" appliance outlets. This increaser is made to operate with inserts and stoves that use oil or wood pellets as a fuel source. It can resist temperatures as high as 570 degrees Fahrenheit in the flue. The inside wall is stainless steel .012" thick, while the outer wall is .018" welded galvalume. It's offered in a classy black hue.

Connects 4" PelletVent Pro pipes to a 3" appliance outlet Modern galvalume finish 1" clearance to combustibles 4.5" high Limited lifetime warranty