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Fantastic. Re-piped it again and still nothing. Time for a second monoflo. Only problem I just spent an hour online trying to source a 1" x 3/4" or 1"x1/2" threaded black tee. Nothing to find!!!

So doing some research I see that you should always have pipes sloping back to the boiler. I do have some upward movement of the return PEX when it comes back to the chase pipe. I'm going to try...

The MonFlo is on the supply side and was already there when I started this project with a 1/2" branch connected to it that was capped right at a hole in the joist where a pipe used to go through. ...

Pulled the lines out. Switched over to 3/4" PEX from supply to radiator and 3/4" from radiator return to chase where there as 3/4"->1/2" reducer directly on the MonFlo tee at the chase. Still no...

The 1/8" tapping is actually tapped into a 3/4" plug with a 1/8" tapped hole.

Yep, have a Taco vent on it. The system filled back up including the new radiator, just not pushing water through it when the system pump is running. I did discover that another piece of Crane...

I recently added a new radiator to my hot water heat system via existing (once used by former owners) stubs on the 1" chase pipe around my basement. From what I gathered studying my system and the...