This pre cooler Weed Star Bubble II Precooler - 18.8 mm - English - Grasscity.com on this bong Weed Star - TX-Burner 2.0 - ICE - English - Grasscity.com They're both 18.8, but I've read that the bowl is connected to the stem, so I'm not sure how that works. if it does fit right in, how do I clear it without using the carb hole ? been reading around, and haven't really figured how these things work, the youtube videos seems like a flippin good time tho, watching big rips and clearing by sliding preecoolers/bowls out. sorry if it's a stupid question, wanting to get my first bong with a pre cooler. Cheers!