Centramatic has been around for a long time and I started using them in the 70's. It is a Texas company, and I was a dealer for them for many years and I used them on all my equipment until I discovered the Counteract. I also have been using Link equalizers for about 30 years.
http://www.linkmfg.com/catseye.html The downside of the Centramatic is that on duals with Cats Eye hoses, it is hard to keep the hoses from rubbing on the Centramatic. I still have some Centramatics on my drop and hook trailers. The beads are much more convenient than the Centramatics, but they do get lost when a tire pops. Centramatics can be reused for many ears. There is a RV park joining my truck yard, and I sold quite a few Centramatics to the snow birds that roost there during the winter. I never tried to sell any of them. Customers came to me on recommendations of friends who had them.
