Might be some sort of adapter for the end of the grease gun to fit the specific type of grease fitting. I have an adapter for the type of fitting that takes a needle point end:

http://www.tooldiscounter.com/ItemD...mp;amp;source=froogle&kw=AFF8090

Have to take anything in a Haynes manual with a grain of salt <img src="/forums/images/graemlins/smile.gif" alt="" />