Durgo offers a line of AAVs and accessories that saves money, time and frustration. The line includes the Durgo Jr. AAV, which is offered with a wallbox, flanges and a grille. These AAVs are ASSE 1050 and 1051 approved, as well as NSF-14, SBCCI and IAPMO-C listed. Durgo's AAVs eliminate roof leaks because they don't need multiple roof penetrations or flashings, and they eliminate loop vents, footer vents and tie-backs.Durgo, Inc.