Review on Bearing Buddy 42201 II: Enhanced Bearing Protection and Lubricant - Silver and Blue Finish by Charles Lardieri

They were used on a light trailer I bought from a tractor supplier, admittedly they don't use the highest quality parts. The old caps were immediately removed and with a light tap of a hammer and a piece of wood they snapped straight into place. Then, after making a few squirts of lube, you can say you're fed up with it, watch a great seal, squeeze the rubber seal and you're done. I've ridden hundreds of miles, taken short trips and even a few long trips and they haven't let me down, so I highly recommend them for ease of use and installation alone.