The DuraVent FSA-DWSW16 is a wall adapter that is used to transition the double-wall pipe to a single-wall pipe. It belongs to the FasNSeal collection that features the AL29-4C stainless steel construction, making this fitting extremely resistant to corrosion and cracking. It measures 16 inches in diameter and 4 inches in length. It is also listed as a UL product.Consistent to offer new innovations in venting systems, DuraVent is making sure that their products can be easily available to their customers. Get yours now at affordable prices here at PlumbersStock.com!