Ace Glass 8099-40 Threaded Vacuum Stirrer Bearing, 9 mm Shaft, 24/40

Modified version of 8098 in that upper member is internally threaded on the top. #7 Ace-Thred nylon bushing and FETFE O-Ring form a compression seal on stirring shaft in place of the conventional tubing arrangement. Easier to adjust shaft, suitable for vacuum work. For use with 8134 stirring shafts.