You can easily reduce the diameter of your bong joints and try out a new combination with your bong with this Grav Labs glass adapter.

This 18.8mm male to 14.5mm Female Glass Reduction Adapter converts an 18.8mm female joint into a 14.5mm female one. This is the perfect replacement or spare part to make your bong compatible with many new accessories.

Made out of top-quality borosilicate glass construction, this adapter measures 2 inches in height and enables you to use a smaller bowl (for smaller sessions) and other accessories on your piece.