Price: Contact us for purchase info: (877) 379-8258

SKU: Series 451 (1")

Product Description

The GURU PC®  freeze protection valve protects potable water bearing systems on passenger cars from freezing when the car heat is turned off. Utilizing our thermostatic technology, this valve monitors ambient temperatures and will drain the system before freezing temperatures can cause burst pipes and tanks, resulting in expensive and lengthy repairs.


  • Eliminates costly freeze damage in a passenger car
  • High flow design for rapid draining
  • Easy installation
  • Minimal maintenance required
  • NSF 61/372 certified
  • Shock  & Vibration tested

Design Features

  • Self-operating thermostatic valve
  • No electrical or air connections required for valve operation
  • Low lead brass/bronze
  • Dual port seals
  • In-line serviceable


The 1″ thermostatic GURU PC® valve is installed at the lowest point within the potable water bearing systems in passenger cars to prevent the water from freezing when the car heat is turned off for switching locomotives or even brief layovers.

This self-contained freeze protection valve monitors ambient temperatures and will automatically drain the system if the air temperature falls to the valve’s set-point, 35°F, preventing burst piping and thousands of dollars in damage. Once the car heat is restored, the valve will modulate closed, allowing for the tank to be refilled before returning to service.

Since the valve is completely mechanical, no electrical or air connections are required for the valve to operate. An electric heater assembly is available for quicker refilling of the water tanks.

System Design Notes

Valves are typically installed inside equipment cabinets or between the inner and outer car body. If a valve is to be installed outside or underneath the car, provide proper protection (e.g. skid plate) to avoid damage from impacts of roadside debris.
All car designs should be properly validated and tested.


1″ GURU PC® Product Sheet
1″ GURU PC® Installation and Maintenance Instructions