Are you looking to hook up to your 14mm male glass rig, but you're stuck with an 18mm male connection? Then grab this 14mm Female to 18mm Female adapter. This glass accessory makes your 14mm male rig compatible with other 18mm male connections, and vice versa, so you don’t have to buy a whole new setup! These pieces are made from high-quality glass material to ensure a clean, pure vapor path.