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I recently purchased a 20yr old home with infloor radiant (hw) heat. One zone includes the bedroom and the bathroom. I’d like to decrease the flow to the bedroom. See the attached pic of the valve on the manifold. I’m not familiar with it; can anyone tell me how to adjust the flow? I’m not sure if it’s like a tap that needs multiple turns, or if a 90 degree rotation will do the trick. Anyone familiar with this? Any help is very appreciated!