GRAV octobowls are the perfect addition to any water pipe or dab rig. The 8-arm built in glass screen allows maximum airflow through your bowl to ensure even burning and minimal clogging. This bowl will turn any male jointed concentrate pipe or dab rig into a tobacco pipe. The large 18mm version holds about 2 grams of ground material...it's HUGE.
Joint Size: 14/ 18mm female