Protect your steam generator with the Mr.Steam AutoFlush System MS81500E, an automatic self-cleaning system that promotes a long and healthy life for MS and MSSUPER Steam Shower Generators. It quietly flushes old water and impurities after every steam shower through a 1/2" 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 1/2" electronically-activated valve Simple plug and play installation Dimensions: 3.3"W (8.4 cm) x 2.5"D (6.4 cm) x 4.3"H (10.9 cm) Installation and Operation Manual Construction Material: Aluminum and Brass