Can the DME Threadless Pressure Plug be used with oil or glycol?
Yes, but do not exceed the maximum pressure and temperature limits.
What is the maximum temperature and pressure limit recommended for the DME Threadless Brass Pressure Plug (inch type)?
The maximum pressure permitted is 72 PSI. The maximum temperature permitted for the component 300°F (149°C), however if running water, it is not recommended to take the temperature of the water cooling over 90% of water boiling temperature specific to your geographical region (water boiling temperature varies with air pressure, and air pressure varies with geographic elevation).
WARNING: If you are running water cooling and manage to boil the cooling water, steam is generated which can cause scalds or burns.