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The Hydra-Cool 21 plate transmission oil cooler is an effective & economical way to keep the transmission at its optimum operating temperature. High efficiency turbulators in each tube direct the fluid for superior heat transfer. Hydra-Cool's unique plate & fin design allows for effective cooling, yet requires 33% less space. The Hydra-Cool's compact design is perfect for applications where available mounting space is limited. Coupled with our 8 inch Thermatic Fan it provides everything you will need to fit your oil cooler.