There is a difference in how seals are made and there are seals on the market today that are inferior to Seals-it seals. Many times we get calls from someone who claims to have an axle seal that has leaked or failed during use. When the seal is sent to us, it turns out to be one of the inferior seals made elsewhere that was purchased at a lesser price and did not last. If you want to do the job right and prevent issues from happening, then use Seals-it made high-performance seals and avoid the problems that come with using inferior made seals.