The COUPLING ELEMENT EM18/28/30 is a rubber replacement part for Edwards rotary vane vacuum pumps. It is also called a spider. This small rubber piece sits between the motor coupling and the pump coupling. Its job is to transfer power from the motor to the pump while absorbing vibration and shock. If your pump is noisy or vibrating too much, this part may be worn out. Replace it to make your pump run smooth and quiet again
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