Alright so I need the rundown on percs and if anybody could post guides for making different kinds that also explain exactly how it works and how to install one in a custom piece. What are everyones favorite kinds, what are the pros/cons to diff styles, etc. Also to clarify that they do what I think they do, the whole purpose is just to break up the smoke into more bubbles so it cools better correct? Sorry for this post haha, im gathering materials for a top notch DIY tube and am covering all my bases. Ill take any suggestions here as well if youve got them.