Matrix SideCar Smooth that vapour out with the Matrix SideCar. This glass comes in either 14mm or 18mm and can be connected to a 14 or 18mm male connection. Depending on which size you choose. While this is not high end glass it does give us the ability to put an affordable price on glass of this size. And at the end of the day the Tank will do the job of more expensive branded glass. Included 1 x 18mm or 14mm Matrix SideCar (Choose Connection Size)