Glass Adaptersare optional attachments for
Water Pipes & Bongswhich convert one size to a different size. There are three standard joint sizes in the market: 10mm, 14mm and 18mm. This 14mm Male to 10mm Female Adapter can turn a 14mm bong or dab rig to a 10mm. So you can use a 10mm bowl/rig on a 14mm glass bong/dab rig.