A tree perc is one of the most popular and well-known percolators. It provides maximum diffusion with almost no added drag. The best thing about ash catchers is they help to keep your bong clean by trapping all the burnt ash before it enters your piece. This will give you better tasting hits and makes cleaning your piece a lot easier and less frequent. This tree perc ash catcher features a 14mm male joint and fits into 14mm female jointed water pipes.