Wally,
I think you are referring to
this tool -- the Grease Fitting Cleaning Tool. NAPA sells one, too, as do most other mechanical tool retailers. I have one and have used it extensively on my truck, the backhoe and other pieces of farm machinery -- at least until I figured out that a box of assorted new zerks (in the correct thread...) was the better answer -- especially on antique equipment with fossilized grease. I was taught to use diesel fuel and to whack the crap out of it -- which usually makes a mess and, on older equipment with fossilized grease and corroded zerks, isn't effective anyway.
JM
