Q: There is a “slamming” when the toilet valve shuts off. I recently replaced floating arms in both our toilets with floating cup ball cocks. Now, when the water shuts off, the valve slams shut hard and it sounds like a water hammer. What should I do?

A: If it sounds like a water hammer, it probably is. This is not uncommon when a brand new valve is installed. Open the valve by removing a few screws, lubricate the gasket and replace. Do this on both valves. If rubber-gasket lube isn’t enough, install an air chamber (shock absorbers) at each of the toilet supply pipes.