| Product Type: | Coupling |
|---|---|
| Size: | 1-1/4" x 1-1/4" |
| Min Temp (F): | -30°F |
| Max Temp (F): | 140°F |
| Temperature Range (F): | -30ºF to 140ºF |
| Torque: | 60 lb-in |

No it is not, it will fail at high temps.
Yes, these fittings can be directly buried underground. They contain plastic and stainless steel and have a very long life expectancy.