Description Our water cooling kit for brushed motor model boats features a pure copper tube and motor circulating water cooling loop, designed to efficiently dissipate heat and improve motor performance. The kit is easy to install and made from high-quality materials for durability and reliability. Features -Color:As Shown -Material:Copper -Size:5.00X4.20X2.50cm/1.97X1.65X0.98in -Note: Inner diameter: 34.5mm. Suitable for540/550 Brush Motor Parts. -Optimal cooling for boat model motors: achieving the most efficient cool system for motors used in boat models. -Tight fit for improved cooling efficiency: ensuring a snug and secure fit to enhance the effectiveness of the cooling process. -Easy installation with secure attachment: providing a simple installation process while ensuring a secure and stable attachment. -Excellent copper tubing for excellent heat dissipation: utilizing top-grade copper tubing to effectively dissipate heat and maintain optimal motor performance. -Specifically designed for 550/540 brushed motors: tailored to meet the specific cooling needs of 550/540 brushed motors commonly used in boat models. Packing list1 x cooling jacket