This is an adjustable length section of Ultimate Pellet Pipe chimney. This will allow for up to 9.5" of installed length. Use to make connections that cannot be made with standard lengths. It has a factory installed O-Ring to maintain a sealed connection.
It is UL listed to standard UL641 as a Type L low temperature venting system. This venting system must be used with appliances requiring this venting standard. Commonly used for wood pellet burning appliances. Galvalume steel outer pipe with 300 series stainless inner pipe. 3" component pieces have 3.75" OD.
1" clearance to combustibles must be maintained when installed.