http://www.youtube.com/watch?v=wiu_IX14wLI
edy boi Member Jan 4, 2011 #2 there special cups.......... cant you see the red valve thing in them.............
Joe Riley The Gypsy Staff member Jan 4, 2011 #4 Jake_H said: Genius! No foam! Click to expand... i was just thinking about that haha.
nate-O.S.K Member Jan 4, 2011 #6 its juss like a valve stem on a bike tube lol its called a one way valve
