What are you trying to do? Are you trying to winterize?
If so, youre looking for two things and not one. You need to find the bypass valves. These are usually right behind your water heater. Then you need to find your water pump which is usually above the fresh water tank. If you cant find it, you may want to turn on so you can hear it.
Lots of threads here that will walk you through the whole process.
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