Kimax® funnel is supplied with a ST PTFE stopper and a PTFE stopcock. Lower stems have an I.D. large enough that a column of liquid will "break" with the stopcock closed, thereby giving a more complete separation and eliminating the necessity of emptying the funnel. Ray-Sorb® processed to protect materials sensitive to the light of shorter wavelengths. Designed from ASTM Specification E1096, Type 4 requirements.