The unique design of this still head allows it to be used as both a condenser and a collection vessel for simple fractional distillations. The threaded side port (8-425) allows easy removal of distillate with a syringe or pipette. The upper threaded outer joint and the lower inner joint are both 14/10. It comes supplied complete with an open-top screw cap (MW-102-33) and Viton o-ring (MW-100-08) for the 14/10 joint and Teflon®- faced septa (MW-104-11) and open top screw cap (MW-102-11) for the 8-425 sidearm. It is a component of the Basic (MW-16-01), Intermediate (MW-13-01) and Deluxe (MW-11-01) Minum-Ware® Kits."