Durable and reliable, the DuraVent 14DT-WT wall thimble is what you need for your chimney system. Coming from the DuraTech collection, a double-wall, all-fuel chimney system that features lightweight insulation and twist-lock fittings for quick installation, this wall thimble is made to be used to provide clearance for combustibles. This can adjust from 4-10 inches wall thickness and can fit between standard wall studs. It has an inner diameter of 14 inches. It is also considered a UL-listed product and is covered with a limited lifetime warranty.Recognized as a technological leader in the venting industry, DuraVent is committed to provide quality and innovative products for their customers. Discover their products here at PlumbersStock.com.