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As mentioned about expansion tank, this is what I also put in.
Before you spend money… open up the area to get access to pump and water lines.
Then have someone turn on pump and then water.
Listen for the knocking that you call hammering.
Anywhere a water line to/from the pump touches something or each other will vibrate and knock. Move the lines gently and listen where it is.
This is a good place to use hvac split foam tubing to cover lines. I split some pool noodles and insulated the lines from each other or where they touched a wall.
Since RV manf use pex tubing to tge pump or near it, the pump vibration is very noticeable.
I disconnected lines on both sides of the pump and got flexible plastic water lines (like some houses). Match the ends to your water line and pump fittings so the screw right on. The trick is to put a large loop in the lines do get lines about 24” long.
The loop and soft waterline nylon/plastic absorbs alot of vibration.
Be certain you isolated your new pump from directly mounting on a wall or floor. You need a rubber isolation pad.
So I have rubber isolation pad, expansion valve, longer flexible water lines and used split foam pool noodle.
RV water pumps will still make some noise.
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