Belonging to the PolyPro collection for polypropylene vent pipes, the DuraVent 4PPS-FF flat roof flashing is a great addition to your vent system. Used for concentric pipe, it protects your vent pipe from other weather elements to penetrate. It measures 4 inches in diameter. It is also engineered to operate on a very high temperature. It is a UL-listed product and is covered by DuraVents limited lifetime warranty. DuraVent has been a technological leader in the venting industry, being committed to provide innovative solutions. Search the one that you need here at PlumbersStock.com.