The Thermal Transfer Products EKT series is upgraded based on the EK series to solve the hydraulic system cooling and installation problems. Through upgrading based on the EK series, the product is equipped with an oil tank flange and can be directly installed in the hydraulic oil tank, which ensures easy installation. The surface area of the aluminum finned tube is increased, ensuring that efficient cooling can be achieved at a low water flow rate. Through the compact design, the product can be easily integrated in the hydraulic power unit so that the requirements for efficient cooling and convenient installation in the hydraulic system are met.