The 14mm GRAV® Female Octobowl is compatible with any 14mm male 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.

The 19mm GRAV® Female Octobowl is compatible with any 19mm male 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.