Hey guys, thanks for your help. My group should have read this information by now, but if they still haven't read it, I just hope they would call me so I can give them more information.

Me and a group of 3 others are working on a pneumatic cannon (designed for tennis balls, if it is any difference). We have just about all the PVC together for a design like the CLAC in the Pneumatic section of the Cannons page. What kind of glue is used for the tire valve? What is it filled using? (...