Found fluid leaking from my rear wheel and after pulling the axle it appears to the seal is gone.

Is there some way of checking the bearing without cutting off the collar that is shrink fit?

I found this part:

Rear axle SURE-SEAL pair for 9N, 2N. No need to split collar and replace old seal. SURE-SEAL fits over top of sweat collar, no need to replace collar and old seal unless bearing needs to be replaced. Priced & Sold only in pairs. SS92$8.88
 
Has anyone used these before?

Any help would be appreciated.[/size][/size]