The 14mm GRAV® Male Octobowl (BO14M(PK)) Compatible with any 14mm female joint. Its glass screen is designed to catch ash and tar and hold plant matter in place, and an arm on the side of the bowl allows for safe handling. The Octobowl's substantial capacity is designed for use with larger water pipes and upright bubblers. Joint: 14mm Male Use With: Flower Designed By: Dave Daily