SmartFlex rigid pipe is constructed with high-grade, 24 ga, stainless steel. This rigid pipe is UL listed to UL 1777, ULC-S635 and comes with a lifetime transferable warranty, valid only if installed/maintained by a chimney professional. This system is great for use with wood and wood pellet applications, including stoves. It requires the use of a standard top plate, top clamp, storm collar and rain cap. If a tee is being utilized, ensure the tee fits properly using an outside dimension measurement.