Permits solutions to be prepared with No. 13654-24 Stirring Magnet and added portion wise. The T-bore stopcock in the equalizing arm permits isolation of the contents for storage. Capacity, 100 or 250mL. Lower threaded stopcock is all PTFE. Outer joint is standard taper 14/20 or 24/25, inner joint is standard taper 14/35 or 24/40 with drip tube. The 100mL size is calibrated in 1mL subdivi- sions, the 250mL in 10mL divisions.