Here is our assortment of downpipes, meaning the pipes that go down into the water of the bong where the smoke is filtered and cooled. The downpipes are available in different models; downstem is the pipe that is made for separate glass bowls, usually in socket size 18,8 or 14,5 mm. Chillum is the kind of downstem that has an integrated bowl, sometimes with or without integrated filter, but it's usually better to buy screens just to be sure. Some stems have a number of drilled holes in the end that goes into the water for even more filtration and cooling, these are called diffuser. Make sure to measure according to this guide to be sure that you found the right stem for your bong. Use this method if you don't know how long stem you need.
