Side operated screw feed instrument for addition of powders and solids, up to 25 mesh, to reactions without problems of seizing or binding. Features a flexible PTFE screw thread wrapped on a precision PTFE-ceramic shaft and contained within a precision bore housing.This offers a unique flexibility in that the thread can move aside temporarily Completely inert materials allow flushing with solvents without fear of contamination. #7 Ace-thred easy assembly/cleaning. 14/20 top female and bottom male joints. Approx. capacity is 15mL.