How to Grease Trailer Wheel Bearings with EZ Lube Grease Cert

How to grease trailer wheel bearings with Dexter's E-Z Lube grease fitting. The Dexter E-Z Lube system uses a tube from the grease cert to the back of the bearing so that the fresh grease pushes the old grease out from the back toward the front. Many grease cert bearing buddy do not have this type configuration and thus only the front bearing is adequately supplied with fresh grease.