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Filter Flasks are thick-walled and have side tubulation for 3/8in (9.5mm) ID vacuum tubing. The 2 and 4L sizes are often used as pycnometers, and GW-76 4L Flask meets ASTM and AASHTO specifications for use as a vacuum container for weighing in air only. 1L flasks can be used in line with SGA-105 #4 Drierite granules as a moisture trap for vacuum pump protection. Neoprene stoppers have 3/8in (9.5mm) hole.
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