KIMBLE® KONTES® Glass Chromatography Column manufactured by DWK Life Science is made from 33 expansion, low extractable borosilicate glass conforming to USP Type I and ASTM E438, Type I, Class A requirements. The column comes with PTFE stopcock and standard taper joint. These columns may be used alone or in combination with 420570 series reservoir and 420575 series flow control adapters.