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Thanks for the comments so far, everyone. HJ: That photo was just an example of the style of my faucet - it's not the actual one I own. Mine says Kohler on it.

The faucet was there when we bought...

Our kitchen sink faucet is a Kohler model that's similar to this one:

20590

The sprayer at the front is attached to a hose so you can pull it out, and the shaft is supposed to swing from side...

So, there's nothing I can do about the sound? Or should I still follow the steps recommended above? Thanks.

One more question: My drain valve comes off a pipe that's attached to my recirc pump. Do I need to turn anything off on the recirc pump while doing any of this? There are handles below and above...

I'd say that picture is worth a million words! :)

Many thanks for the info. Very helpful.

Thanks for the quick response. Is the drain cock the spigot that I attach the hose to for draining the tank?

And what is a ball valve?

My water heater is not quite 5 years old and has been making popping noises, particularly after someone takes a shower or we use hot water to wash the dishes. I know that's supposed to be evidence...