Quote Originally Posted by AliceDee
It depends what size the female piece on the bong is. Mine is 18.8 but there's other sizes - 14.5 pretty common.

The downtube is just the one that came with it, it's nothing fancy, 6 slits with a hole at the bottom.

I wouldn't mind getting a RooR diffuser though.
sick bong bro, I got a double perk on my VIP glass bong.
maxsuperdanks Reviewed by maxsuperdanks on . Local 18.8 Shop Bong with RooR CF/Bowl Here's my 18.8 bong that I've been using for a while. The downstem has 6 diffuser slits and an open bottom. Just got the RooR carbon filter and bowl today. (RooR glass screen too, fits nicely!) The bowl's quite the monster, it didn't look so big in the picture. Oh well :stoned. But the carbon filter is amazing. Keeps everything below the carbon filter clean as a whistle so you can same lots of time cleaning. Not to mention gives a great hit for a long time and when it gets kinda nasty you Rating: 5