GURU® Rebuild Program

GURU® Plugs for Locomotives

ThermOmegaTech® offers a rebuild program for the self-actuating GURU® plugs that protect thousands of locomotives from freeze damage every year. Our rebuild program allows you to return your old GURU® plugs to be cleaned, refurbished, and retested so you essentially get back a brand new valve.

Recommendations on Maintenance

ThermOmegaTech® recommends changing the GURU® Plug every 18-24 months. The characteristic tendency of the GURU® Plug actuator is to lose a small amount of stroke as it ages beyond one year. This causes the release temperature to creep upward, as well as the manual reset temperature. While this is a “safe” tendency as far as freeze protection, eventually the upward creep can cause nuisance dumping.


The GURU® Plug’s colored cap serves as a visual indicator of the year in which it was built. There are five colors that rotate, each associated with a year. View the cap color chart here. The month and year that the valve was manufactured is also laser marked on the top of each cap.

How the Program Works

  • Valves are returned with a purchase order to our facility
  • All components are scrapped except cartridge body and hex nut
  • New thermal actuator and components are assembled into the cartridge
  • Cartridge is 100% tested and inspected
  • Hex Nut is assembled and inspected
  • Cartridge is inserted into the Hex Nut
  • Completely assembled GURU® Plug is leak tested
  • 100% Final pop test is completed

We also now offer a UTEX program:

  • Purchase orders of 50 pieces or less will be processed upon receipt of the order
  • The cores will still need to be returned to us and we will continue to monitor for any damaged valves or discrepancies

Contact our Rail Product Experts to Place Your Rebuild Order Today!

GURU® PC for Passenger Cars

GURU PC® valves, used to protect passenger train cars’ potable water-bearing systems from freeze damage, are also recommended to be replaced every 18-24 months due to the characteristic tendency of the thermal actuator losing a small amount of stroke as it ages beyond one year. This causes the release temperature to creep upward, eventually causing nuisance dumping, but not compromising freeze protection.

For the PC valves, we offer replacement cartridge assembly kits to allow for easy in-line maintenance in the field to minimize downtime.

How it Works


  • Contact our Railroad product team to purchase a replacement cartridge assembly kit
  • Remove all internals from the installed valve
  • Clean threads, internal surfaces of the body, and valve port of all dirt/grime and mineral buildup
  • Insert replacement cartridge assembly into the body
  • Test the valve by spraying the actuator with freeze spray