Greek Glass BTK Dab Rig*The recent models have a thicker mouthpiece than in the photos 8. 5 tall 14mm ground joint Perfect vortex and bubble dumping function 3 seed perc Extra thick glass in all places, this version of the BTK is slightly improved from the last. The main changes are the percolator size being reduced by 20% as well as an adjustment to the drain. The function on these is very smooth and light for a recycler.