The 10x18x18 brush type R87 for ECO MV44 by Gianneschi is a crucial replacement part for the maintenance of ECO MV44 series pumps. Carbon brushes are vital in electric motors as they facilitate current transmission between the moving and stationary parts of the motor, ensuring proper functioning and efficiency. The dimensions of this brush are 10 mm in width, 18 mm in height, and 18 mm in length.