Forgive me for reviving an old thread, but I have been saving these things up for a while. ( coors lite) now I bought the 16 gram co2 cylinders on eBay . They appear to be the same length ,almost the same width. The neck is slightly narrower, and has a slight taper on them. They are Leland 16 g. #42104 but when I screw them on all of the gas seems to escape pass the o ring. Has anyone else experienced this issue? It's really tickin me off to hear how many people are enjoying their coors lite homebrewing taps and I can't get one to work to save my life.