After noticing a massive water loss when filling up the Washer Fluid Reservoir, quick Inspection determined that the Rubber/Silicone Plugs in the motors had deteriorated entirely.

Ideally, you'd want to print this in 100% infill to prevent as much leakage as possible, additionally, they should be printed with either PC, ASA, or TPU, any material that can withstand slight flexion and have minimal moisture absorption.

The model is similar to this part: NICE Washer Pump Grommet NWG501 | Sparesbox