Sealing-Ring for TuffTorq-Transmission/Gearbox for the Viking MB555E and most likely all other wheel-powering Viking lawnmowers of the Model-Series.

Dimensions

Inner Diameter: 12.55MM
Outer Diameter: 24.20MM

Design-Improvements

Uses 3 inner sealing-lips instead of the 2 from the original design for increased longevity and tightness.

Assembly notes

Add some silicone grease to the printed rings to keep the TPU flexible and reduce wear.
Use liquid sealant on the gearbox/transmission sealing surfaces.