That is an ash catcher.
It is a special type of slide that is meant to keep ash and bits of scorched weed out of the main chamber of your water-pipe, keeping it MUCH cleaner and allowing the pure flavor of the weed to pass through rather than nasty bongwaterstank.
You all know what a PITA it is to properly clean a bong. The ash-catcher makes that a MUCH easier chore that you don't have to do NEARLY as often.
stinkyattic Reviewed by stinkyattic on . What is this piece called? (photo included) hey guys, just wondering what this is called so i can search some internet smoke shops for one. a friend left it here the other night and i have been smoking with it ever since and love it. but i want to get one that is meant for a glass on glass bong. and one that has more color. Anyway, what is this piece called? Rating: 5