HYDRO MASTER Water Hammer Arrestor,Clean Brass,1/2"MNPT

Good , solid, product ..works as expected

Seems to be holding up. Stopped the hammering I was getting

It appears to not work. I purchased this as a replacement for an arrestor that failed after two years. What I noticed on this one was there's a non-metallic object in the bottom above the fitting where the piston would be. I don't know if this is the "ball" other purchasers mention being stuck. In any event the pipes are still getting rattled.

(HYDRO MASTER Water Hammer Arrestor,Clean Brass,1/2"MNPT) If you have not seen the other reviews, something about the manufacturing process causes the ball inside to get stuck and needs to be dislodged before use. I used the back end of a ballpoint pen (perfect fit) and a rubber mallet, it was not easy and I had to strike it pretty hard several times in a row. If you also decide to do this, make sure to use something malleable like a pen because a metal tool will likely damage the ball. Other than that, I totally think it was worth it and the product itself does the job.

I already had a TEE with a plug, so took the plug out and screwed this in. The shaking line and noise seem to have been eliminated. One concern I have is that it is outside. BUT we turn the water supply off in winter as several lines are exposed.

A device like this is essential whenever you have any applications that use solenoid valves that close quickly. Water is a non-compressable fluid, that is traveling at a high speed, that collides at the end when the valve closes. The water hammer arrestor is like a shock absorber. They solve problems when installed near dishwasher, laundry or smart toilets. They will prolong the life of the domestic water line.

did not arrest water hammer in drinking water line. May work in other applications.

Simple install, works great