This Water Tool Adapter is designed specifically for the Pax 1 (will NOT fit Pax 2 or 3) and allows you to drop your Pax into any water tool with a 14mm female joint. Drawing your vapor through a water tool bubbles your vapor through a water reservoir which both cools the vapor and filters it to make sure it is as pure as possible and gives you the smoothest and tastiest hit possible. Please note: this is an adapter only, the Pax 3 is NOT included.