Zob Beaker with Fixed Flat Disc Diffuser Check out this beaker from Zob Glass' "Fixed" line of water pipes! It's approx. 14 inches tall. This beaker features a fixed down stem with a flat disc diffuser on the end of it. The flat disc perc makes a shit ton of bubbles for some great diffusion! The pipe has a three-prong ice pinch. It's made of 5mm. thick American made glass. This beaker has everything you need! It comes with an 18mm. ground glass slide. Zob goes to great lengths to make sure every piece is one of kind, so the label will most likely be different than the one pictured. - Perc: Flat Disc Percolator - Features a Three Prong Ice Pinch - Height: 14.00 inches - Base Width: 5.50 inches - Glass Thickness: 5.00mm. - Tube Diameter: 50.00mm. - Down Stem: Fixed Down Stem - Slide: 18.00mm. Ground Glass Slide - Made in California