This 14 to 18mm adapter is designed to function as an easy and effective bong bowl joint converter. Simply snap onto the taper of our 14mm Invincibowl and you’ll transform it into an indestructible 18mm smoking accessory. The adapter features an internal o-ring which ensures that your adapter will not fall off the bowl. This premium adapter also features our pressure lock and release tapers on the inside and outside, which ensure the bowl will maintain a solid seal but can be effortlessly released when desired. Expand any 14mm male taper into an 18mm male taper effortlessly. Fitted to work with most glass bowls and bangers, too!