Here is a review left by a customer on a product. Would you say he was satisfied or dissatisfied?
Title: It worked for the most part.
Review: Since we had to change out our leaky toilet, we bought a high efficiency one to replace the old 3.5 gpm one. Since the valve closes so much faster, it created a significant bang in our pipes. We researched and came across water hammer. We tried a few things like turning off the main water to the house and draining the pipes and turning it all back on. When that didn't work we learned that we may need an arrestor. So, we found this one. It works well, hammer is stopped for the most part. There is a small noise in the wall after it flushes but it hardly sounds harmful.My only complaint is that now our 9" supply line is such a tight fit, it's nearly crimped in half in order to curve up to the arrestor coming off of the toilet tank. When it flushes there is a slight hiss sound coming from it when it's refilling. I searched everywhere for a shorter supply line and found a 6" on here that I hope will work. Otherwise we will keep what we have and hope it doesn't break.
