The all-metal end ring, used exclusively in FAST'S® couplings, eliminates the need for any type of perishable lube seal (o-rings, lip seals, cork gaskets, etc.). The end ring not only provides the dam over which lubricant must flow to escape, but it additionally pilots the sleeve with respect to the hub during start-up and shut-down operations. It further eliminates partial tooth disengagement with resulting tooth overloads by providing sleeve teeth which are flush against the inside wall of the end ring.
It is the only coupling designed to use oil lubrication. To be sure that your couplings provide Maximum Life, always specify FAST'S® couplings, with the all-metal end ring.