Filter Flasks and Rubber Stoppers with Fitting

The thick-walled filter flasks feature side tubulation for 3/8” (9.5mm) ID vacuum tubing.  The 2,000 ml and 4,000 ml flasks are great for use as pycnometers.  The 4,000 ml flask also meets ASTM and AASHTO specifications for use as a vacuum container for weighing in air only.  For testing with the SGA-105 #4 Drierite granules, the 1,000 ml flask is used as a moisture trap for vacuum pump protection.

The neoprene stoppers with glass tube have a 3/8” (9.5mm) hole and a glass tube.  Each sized stopper fits a different size filter flask.  The stoppers also come without the glass tube.  The No. 8 stopper works with the 1,000 ml flask.  The No. 9 stopper works with the 2,000 ml flask and the No. 12 stopper works with the 4,000 ml flask.