Since others mentioned ez-lube hubs, I thought a few of you might be interested in this link.
Note the paragraph under grease guns that mentions that most high pressure guns deliver over 10,000 psi of pressure & that most seals can only withstand 500psi.
Even though our new Mountaineer has the ez-lube axles, I don't think I'll be lubing the bearings this way just for that reason.
http://www.machinerylubrication.com/Read/584/grease-gun