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Thanks. Does it matter if it is mounted above the hot outlet or cold inlet.

Can anyone identify this part and explain it's purpose. it is mounted on the cold water inlet to an electric hot water tank. ( It is mounted vertically. Pic uploaded rotated 90') Thanks

New Thanks for all of the responses. FYI, the problem was with the pressure switch. I couldn't see why it would not start the pump at the low pressure setting but it didn't. A new switch fixed the issue.

A few more tests and observations today. I reset the air pressure to 43# with the water at 0#. No change to the symptom. The device under the gauge does not appear to be a check valve. It has 75Lbs stamped on the cover and has an outlet so it appears to be a pressure relief valve of some...

I will have a look at that.

Thanks Valveman I believe that the device in front of the gauge in the pic (sorry for the side view) is a check valve but I am not sure. To clarify. Outside hose on - water flows - a couple of minutes. While the water is flowing the pressure gauge on the tank start to drop from 45#...

Thanks Valveman I believe that the device in front of the gauge in the pic (sorry for the side view) is a check valve but I am not sure. To clarify. Outside hose on - water flows - a couple of minutes. While the water is flowing the pressure gauge on the tank start to drop from 45#...

Typical submersible pump with a pressure tank and pressure switch in the crawl space. The system is connected to one outside tap for irrigation only. Pressure switch shuts the pump off at 45lbs. When the tap is turned on water flows until pressure reduces to 35lbs. Pump is not switch on so water...