The Ash Catcher with Box Perc by UPC is a great additional accessory to keep your water pipes clean and offer extra diffusion and filtration. This ash catcher features a box perc which has holes and slits for the smoke to pass through first, before even going into your desired water pipe through the joint. It creates diffusion and filters the smoke to initialize smoother, cleaner tokes. This piece will retain any burnt up ash from the built in flower bowl and not allow it to transfer over into your bong keeping your prized possessions clean. This piece is available in either a 45 degree or 90 degree male fitting in either 14.5mm or 18.8mm diameter. Its variety of combinations allows you to choose whichever one fits your water pipes best.