Bests & Worsts Reviews from Amazon

I didn't have a severe water hammer problem with my Kenmore top-loader but there was a noticeable CLUNK when the water shut off, so I decided to give these a try. These were a great find because I never knew there were screw-on arresters and thought I'd have to learn to solder or spend a bundle on a plumber. Installation was as easy as hooking up a garden hose -- hand-tighten and then a quarter-turn with some pliers. Hot and cold each have their own arrester, which I connected to the back of the washing machine (the preferred method according to the manufacturer). Now, the only sound I hear is the mechanical shut off -- not the hammer. I'd call it magic, but it's just physics! TWO MONTH UPDATE - March 2012: Still working as new. Still a happy customer! FIVE MONTH UPDATE - June 2012: No complaints. Still nice and quiet. ONE YEAR UPDATE - January 2013: Hammer free! Working perfectly. TWO YEARS+ UPDATE - September 2014: Sorry to report these might have started to fail. A few months ago I noticed a sound in the pipes when the washing machine in the basement shuts the water. These are still under warranty and Sioux Chief is shipping me replacements. I'll follow up here and let everyone know what happens.