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Mixing valve and check valves
Former owner had a dog wash tub installed in garage (nice!) but there is a loud rattling sound emanating from this wall whenever the lawn sprinkler system (which is down-stream on the cold side) comes on. I opened up the wall and see that there are check valves on both the hot and cold ahead of the mixer valve, and I'm pretty sure it is the cold-side check valve that is causing the vibration. (The tee-off going to the sprinkler is between the check valve and the mixer valve.)
1. Does this make sense?
2. Is it okay if I just take out the cold-side check valve?
3. Or if it is required, do you think it would help to move the tee to upstream of the check valve?
Thanks for any advice you can give me!
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