The AOT Provost 2 is a heat management system for your bowl. The Apple On Top Provost do fit all bowls when using foil for the perfect session. Whether you are enjoying a smoke session outdoors or indoors, this heat manager acts as a wind protector/cover to preserve heat from your charcoal. Simply pack your bowl, add the fully lit hookah charcoal onto the provost screen & cover with the provost HMD cover! This bowl heat regulator features a swivel that opens & closes vents to allow you to either preserve the warmth from your coals or to cool down your shisha bowl. Provost is also used with standard shisha tobacco bowls on the market.