This is the heavy duty version of the PS1000 seal.

This part fixes the following symptoms: Leaking between the motor and the seal plate (mounting plate.) If this seal leaks for to long, water will leak down the motor shaft and into the motor, ruining the motor. If your motor is making a loud screaming noise, this has probably already happened and is advised to replace the motor. Always replace this mechanical pump seal when dismantling the pump.