DuraVent PelletVent Pro 3" Inner Diameter Stainless Steel Vent Elbow with Black Outer Wall - 45-Degree: This unit requires venting pipe with an inner diameter of 3". This vent elbow is used to connect a pellet stove to a vent. The elbow has a diameter of three inches. It has a dark exterior. It's made to work with corn-burning stoves and wood-pellet-burning stoves and inserts in particular. You can use the elbow to go past venting barriers. At the base, the elbow swivels all the way around. The inner wall is stainless steel with a thickness of .012". The outside wall is galvalume with a thickness of .018". The structure is double-walled and air-tight.

45 Degree Elbow Efficiently vents pellet and corn-fueled stoves and inserts Offsets venting obstructions Swivels 360 degree at base .012" stainless steel inner wall and .018" galvalume outer wall Air-insulated double-wall construction Laser-welded seams Secure twist-lock connections Sleek black finish 1" clearance to combustibles 3" inner diameter with a 3 5/8" outer diameter UL Listed Limited lifetime warranty