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Ever See One of These?

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Ironman
Ironman Member Posts: 7,857
in THE MAIN WALL
Found this on the return side of rad on a 2 pipe air vent system where we're replacing the boiler. I assume it's there to add some resistance to the return side since there are no traps. Anyone ever see this before?
Bob Boan
You can choose to do what you want, but you cannot choose the consequences.

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