Product review (5 stars): Works Perfectly
This is the 3rd water hammer arrestor that I've installed in our house. The 1st two were installed on the hot and cold water lines for our washing machine and worked great for stopping the water hammer there. Our refrigerator started developing a pretty severe water hammer any time water was used anywhere on the 1st floor. Eventually it got so bad that it started damaging the seals for the water filter that fits in the bottom of the fridge. I looked for small arrestor that would fit on the plastic water line but no one locally carried them (Home Depot, Lowes, etc). I eventually found this on Amazon and ordered it. Installation was very easy, it probably took me about 5 minutes total. The only issue was I didn't have enough room in the wall insert to fit the arrestor. I ended up mounting it on the line closest to the fridge and then just taped the arrestor to the backside of the fridge so it didn't put weight on the water line.

This arrestor completely resolved our water hammer issues. We've had this installed for the last 4 months or so and it's still going strong.
Highly recommended if you have any kind of water hammer at your refridgerator.