Moser axle ?

I just ordered a new set of axles for my '70 Challenger 8.75", with sealed bearings installed. I asked about the axle seal..Tech guy said I didn't need them, the new bearing has an oring that seals the housing. I've installed moser's before albeit years ago, I knew about deleting the adjuster but don't remember deleting the seal. Just wanna make sure. Anybody ?

Leave the seal in.

Thanks, that's what I thought.