New to me take on a Monoflo system.

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Glennhvac

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Was at a house for routine boiler fall check and saw this piping arrangement through out the basement. Took awhile before it dawned on me that they were using a choked down section of pipe between each tee to achieve what Monoflo tees typically are used for. Tee on right is supply, left side is return.
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Tuttles Revenge

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I ran into that on a job too.. But I didn't know anything about hydronics at the time either and somehow managed to get my hands on some monoflow tees and installed them properly.
 

Fitter30

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1940's house by chance? Monoflow system tees don't all look the same. Some just use a orfice plate in a union between tees on a gravity system. There tons of info on these systems when energy was cheap, way before computers and manufacturing processes.
 
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