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The GURU® DL 2.1 is installed at the lowest point in a locomotive’s engine coolant system to automatically and continuously sense the water temperature to prevent water lines from freezing. When the cooling water temperature drops to the valve’s set-point, (Standard offerings: 35ºF or 40ºF) the valve cartridges will release, draining the locomotive cooling system before any freeze damage occurs. After a drain occurrence, the valve cartridges can be heated and reinserted back into the hex nut to refill the water tank and promptly return the locomotive to service.