Hello, I got the "cane b" two days ago. Yes, the vapecane is 14.4 mm in size at its lower extremity. There is still a 14.4 mm (female) to 14.4 mm (male) adapter if you wish, which is used to put the metal grid and the herbs inside. Otherway I think, on the 18.8 mm model, it should be a 14.4mm...