P5V6 Neocision Distillation Head - USA MadeP5V6 Distillation Head P5V6 Distillation Head has 6 sets of vigreux in the distillation column with 34 45 lower joint and 24 40 upper and side joints and includes GL 14 barb connections. MADE IN THE USA Designed for 5 Liter Flasks Set of 6 vigreux to allow for packing media Larger vacuum jacket allows for less heat loss during distillations Larger vapor path to allow for gas vapor phase flow Increased internal diameter for faster, more efficient