The local store(s) around here don't have a big selection, as far as "accessories" for water pipes (ash catchers/precoolers & percs, etc.)... at least not for the size I have, so I have been browsing online for something decent at an affordable price. My question is, if I have a piece with a down-stem that accepts a 9mm bowl/slide, what is the size of the down-stem, and accessory stems that would accept a 9mm slide? Currently I have an ash catcher with the bowl built into the top, and the slide is 9mm, which I use completely in-place of the original bowl. I would like the option to add other pieces between the pipe itself and the ash-catcher, or buy other add-ons in place of the one I have now. I can take a picture(s) of the current setup I have now, if there is any confusion as to what I am asking.