This is a genuine WhiteWater dispenser. Out of the bottle as clean as it went in. Fast flow, no reservoir, no biofilm growth, guaranteed not to drip. These fit most 3 , 5 or 6 gallon water bottles which have a 48mm cap size. Rinse valve in hot water before using. Because bottled water contains no chlorine, invisible microbrial growth may occur if valve is not washed thoroughly at each bottle change. Use these dispener taps with the For Your Water metal stand!