Black Leaf' 3-Chamber Pre-Cooler with Rasta pattern. This Pre-Cooler has a 17-Slit Diffusor with SG 29 Friction-Fit ground joint. The bowl has a SG 19 Friction-Fit ground joint. Due to the long length of this Pre-Cooler, end customers should check the available space of their own bong, to ensure its suitability. This Pre-Cooler connects to any glass bong with a standard SG 19 friction-fit ground joint. The 'Black Leaf' logo is on the middle chamber.