This glass can be used with or without water and offers the extra cooling expereince. The mouthpiece joint is 14mm female and side joints are 14mm and 10mm female.  It is a 8 in 1 full kit includes the glass, whip mouthpiece, glass mouthpiece, glass stoppers and keck clip. You can use 1 or 2 device with it at the same time. Double your experience.