| Thread Type: | PEX Crimp x MNPT Male |
|---|---|
| Size: | 1/2" |
| Lead Free: | Yes |
| Brass Alloy: | C69300 |
| Material: | Brass |
| Application: | Heating Plumbing |
| Max Pressure (PSI): | 200 |
| Warranty: | 5 Year |
| Standards Met: | ASTM F1807 |
| Fitting System Compatibility: | Crimp Clamp |
| Tubing Compatibility: | PEX |
| Max Temp (F): | 200°F |

No it will not, the threads will not match, it will strip one of the fittings and most likely leak.
Yes, as long as the radiator pipe has 3/4" female NPT thread.