Add grease zerk to axle or not?

I use mine. Been using them for over 10 years. I generally take the drum off and check the bearings, etc. every other year, and use the EZ lube the in between years. Even the years I take the drum off I still give the EZ lube a couple of shots. Lot of false information on here - you don't have to fill the entire void in the hub, your chances of blowing out the seal are near zero - unless your trying to fill the entire void in the hub (alot of people confuse EZ lube with bearing buddys). Just make sure you use the correct grease as recommended by the manufacturer and you're good to go. P.S. If the bearing went out you can expect the seal to be compromised. That had nothing to do with the EZ lube feature. You have to check the bearings regularly. You can check the bearing simply by jack the tire up occasionly and checking for playing and listening/feeling/looking for anything unusual while you spin the wheel.