Mixer valve produced a "knock” inside the product every-time a valve in the home water system was turned off. This product was a one for one replacement of a single handle mixer valve. The knock was not identified until AFTER a full bathroom renovation. After troubleshooting for water hammer, including adding water arrestors & removing drywall in the below floor ceiling, it was identified that the knock was coming from this product. Licensed plumber verified water pressure at the home was within standards. Ultimately had to demo the shower and replace this mixer valve with a different manufacturer, which thankfully no longer produced the "knock”. This confirmed the BWE mixer valve was producing and was the cause of the "knock”. This defective or poorly manufactured product directly resulted in additional incurred costs to repair and replace. *Attached video with audio was taken after a toilet tank auto refilling and the knock occurs when the toilet valve stops. The sound occurs when manually turning off the sink faucet and is even more violent when the washing machine turns off the water supply during use.*
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