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GURU DL 2.1 Plug
An automatic freeze-out plug with one important difference: The stainless steel GURU Cartridge releases itself from its body at a pre-set water temperature (35°F or 40°F), rather than being forced out by the tremendous pressure of expanding ice. This provides almost a full one inch bore to rapidly drain the typical locomotive before damage can occur. Resetting and rearming the GURU DL 2.1 Plug is easily accomplished by simply reheating the cartridge and utilizing the slotted actuator feature along with the GURU Flag and Clip. This feature prevents the GURU Plug from triggering open while refilling the cooling system with cold water and provides highly visual indicator of a deactivated GURU valve.
Design Features

  • Actuator sensing surface is only wetted part
  • Long service life: All moving parts are stainless steel
  • Design excludes cooling water chemicals and other debris from moving parts
  • Easy maintenance
  • Several body styles available for various applications: 1-1/4 NPT tee, flanged tee and compressor flange.
  • Paint mask minimizes accidental paint-ins
  • Knob on cartridge for easy installation and removal even in awkward locations
  • Choice of release temperatures: 35°F or 40°F 
GURU DL 2.1 valves are covered by a one year warranty
Standard setpoint temperature of  35°F or 40°F

  • Will not trip or dump while locomotive is running
  • Easy installation
  • Completely mechanical - No electrical or air connections
  • Not affected by air flow or air temperature surrounding valve - releases only when cooling water reaches setpoint
  • Rapid draining
  • Easy system refill
  • Models available to convert existing freeze protection
  • Easily tested in field
  • Slotted actuator feature prevents accidental dumps when refilling cooling system with cold water.
  • Unit automatically rearms after filling and reheating
Rebuild programs available.