Genuine OEM 285753A Motor Coupling. This coupling is a three-part piece. There is a coupling for the motor and one for the transmission. In between is a rubber grommet. Motor couplings act as a safety device, very similar to a shear pin. If the transmission or motor should seize, the motor coupling will break to protect any further damage to the more expensive parts. It's almost like an electrical fuse. If the coupling is replaced, and it breaks a few loads later, a more serious issue within the transmission or motor could be presenting itself. 285753A has a metal-reinforced core for added durability.