Protect your steam generator with the Mr.Steam AutoFlush System CT81500, an automatic self-cleaning system that promotes a long and healthy life for MAX Steam Shower Generators. It quietly flushes old water and impurities after every steam shower through a 1" electronically-activated valve. No work is needed on your part but rest assured you get a clean steam every time. Automatic self-cleaning system that promotes a long and healthy life for steam generators Flushes old water and impurities after every steam shower Quietly flushes through a 1" electronically-activated valve Simple plug and play installation Dimensions: 4"W (10.2 cm) x 2.4"D (6.1 cm) x 4.4"H (11.2 cm) Installation and Operation Manual Construction Material: Aluminum and Brass