A smooth flow of direction in your ventilation system is now easier to achieve with the DuraVent W2-IPSDF9 IPS drain fitting. Using a 1-inch NPT thread, this drain fitting is designed for connecting iron drain pipe to flow acidic condensates to a neutralization tank before disposal. Applicable on a double wall construction, it measures 9-inches in diameter and 3.5-inches in length. It is also extremely resistant to corrosion and cracking as it is made from the AL29-4C stainless steel.This DuraVent W2-IPSDF9 is listed as a UL product and is also covered by DuraVents limited lifetime warranty.DuraVent has been true in giving you the quality products you deserve. Search their quality products at affordable prices only here at PlumbersStock.com!