M8 bonded sealing washer

The primary use of this M8 NBR bonded sealing washer on Urals is for the nine bolts holding the rear bearing housing to the crankcase.

They're also used on the gearcase rear cover to seal the adjuster screw locknuts.

And a couple years (e.g. 2015) had a funny little drain plug on the bottom of the front cover, below the spin-on oil filter, and this fits that drain plug as well.