The airflow through this precooler moves downward through the tree percolator which contains 11 arms, each housing3 d-slits and an open-end for pure diffusied bliss. Keep that favorite bong or dab rig of yours clean and hitting smooth. This ashcatcher is made from clear borosilicate glass and is available with colored accents on the head of the tree perc. The joint for connection to the water pipe is a 45-degree angle and is available in both 14mm and 18mm options. Be sure to choose the right size and color when ordering. The stem for the bowl is a female joint with a male jiont to connect to your dab rig or water pipe.