Not sure what to say other than it works. I wish some of my other gear was as serviceable as my 1970's era Coleman stove and Coleman Lantern. I bought one to repair my stove and a 2nd to keep on hand a spare. As part of the old Coleman simplicity in design, one pump stem works for either unit. It has caps for both old style (metal) and new style (plastic). I took the old unit out and put the new one in and was done in minutes.
I'm glad the parts are still widely available for my older lantern and stove. The pump plunger does indeed fit bit not perfectly and the replacement is a bit of a pain. 3 stars because they seem pricey, tough to install, and Coleman doesn't use the leather washer that used to last forever!! These do the job and you don't have much of a choice.