preemo- 8-Arm Tree Perc MiddleThis 8 Arm Tree Perc Middle piece from preemo is designed to fit into the middle section of your DIY bong setup. It works by providing additional filtration as the smoke passes through the 8 arm tree percolator, which breaks the smoke into smaller bubbles, cooling and smoothing each hit. To use it, simply insert the bottom joint into the existing tube of your bong, and then connect your bong's top piece to the upper joint of this middle section. This