1.5" PVC, 3/16" brake line w/ferrell fitting, 8mm socket for single hits. The tube bends inside and goes down to the bottom. I use my thumb to cover the carburater hole in the back. Total about 12" tall. Take a long slow draw, then uncover the hole in the back for the "hit" - cool and smooth. No screen needed. Just suck the ashes through (the water will catch it) When sharing with 2 or 3 other people, just drop 4 or 5 ice cubes down the top and there ya go.