| Connection Size: | R20 |
|---|---|
| Material: | Brass |
| Tubing Compatibility: | PEX,PEX-AL-PEX |
| Manifold Compatibility: | EP Truflow,Truflow |
| Flow Range (GPM): | 0.15 to 0.8 gpm |
| Warranty: | 10 Year |

According to the manufacturer, all of their manifolds stay true to the R-20 connection for the loop connections. To answer your question, yes they will fit their older 1 1/4 Brass manifold.
Yes they will work. I added them to a 5 loop system with what must be an older model manifold as it did not have the flow meters. They attached with little effort. I had to shorten my return lines by the length of the flow meter and I was in business. I used the regular flow meter 0.15 to 0.8 gpm and flow about 0.5 gpm on all five loops. Makes it real easy to balance the system. John Neydon
You read the meter at the top of the yellow line, where the spring meets the yellow indicator.
No, this unit can not be used as a stand alone unit. The thread type on the flow meter is specific to the Uponor radiant heat manifolds.
Yes, these flow meters can be taken off the manifold and be easily cleaned.