For water temperatures up to 275 degrees. 
Dial Controles 55 Series Thermostat Range settings form 50 to 300 degree F with Capillary & Probe (1/2 inch Probe Union Kit sold separately)
Installed on Prochem Legend SE AD, Blue Baron and White Magic Comander and HO truckmounts. 

Compare to current or past OEM associations:
White Magic A138
BlueBaron 
Prochem 35-900182
Prochem 8.617-810.0
THM55S50/300

***NOTE This Thermostat requires a Probe Union Kit:

 https://www.truckmountstore.com/thermostat-union-probe-packing-kit-1-2-inch-union/