The patented vacuum mixing stopper sized for TS29 taper joints. Twelve thin Teflon fins seal the larger joint, and a gland packing shaft seal holds vacuum while the shaft turns.
TS29 taper joint fit: Drops into standard 29/42 jointed flasks
Patented fin seal: Twelve thin Teflon fins seat against the glass for high vacuum retention
Sealed rotating shaft: Teflon cup seal with O-ring gland packing keeps pressure while stirring
Serviceable design: Replacement gland seals and internal parts available
Fits with: flasks with TS29/42 taper joints, on any mixer running a ø8 mm shaft.