ITEM NAME:Black 20mm Water Cooling Accessory/Jacket for 2030/2040 RC Brushless Motor Description: Inner Diameter: 20 mm Outer Diameter: 25 mm Length: 25 mm Inlet/Outlet Diameter: 3 mm Application: for 20mm diameter brushless motors Package Includes: 1 Pc Water Cooling Jacket Note: Please allow 1-3 mm error due to manual measurement. Color might be slightly different due to the color calibration of each individual monitor. SKU: MNF0019219876005478.1 Pc Water Cooling Jacket. SKU: MNF0019219876005478.