Dura-Vent 3PVP-E45 3 PelletVent Pro Galvalume 45&deg; Elbow Laser-welded, double-wall pipe with a .012" inner wall of 444 Stainless steel Outer wall of .018" laser welded Galvalume Encapsulated O-ring gives secondary seal to system. 1" clearance to combustibles in the US and Canada. Offset as needed, swivels 360 degrees at base for alignment