The DuraVent 30GVTC tee cap is a durable fitting for your type B gas vent. This is designed to cap the standard tee or increaser tee on your vent system. Also, it can also be used to clean out debris when you remove it. It measures 30 inches in diameter and it fits on the inner liner. It also features the DuraLock system that provides a secure and tight connection. This is a UL-listed product and is covered by DuraVents limited lifetime warranty.As a technological leader, DuraVent is consistent in giving their customers innovative and high-quality products. Discover all these products at affordable prices here at PlumbersStock.com.