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ordinarily_confused

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Can anyone tell me what this part is and how to use it or adjust it? I have a circulator pump on my water heater for instant hot water. There are two of these devices--one on either side of the pump. There is no water flowing through the pump after I had a new water heater installed. If these are gate valves or ball valves, I want to make sure I have them open (perhaps the plumber closed them and forgot to open them). I tried turning the screw and then also turning the hex nut. Some water dripped, but no flow. I may have a failed pump, but I still need to know how to set these devices correctly. Thank you.




 
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