Chromatography Column "PSAW" With integral sintered disc and PTFE (Teflon) key stopcock 357/01 Effective Length 15 cm., Disc Dia. 10 mm. 357/02 Effective Length 20 cm., Disc Dia. 15 mm. 357/03 Effective Length 30 cm., Disc Dia. 20 mm. 357/04 Effective Length 40 cm., Disc Dia. 20 mm. 357/05 Effective Length 40 cm., Disc Dia. 30 mm. 357/06 Effective Length 50 cm., Disc Dia. 30 mm. 357/07 Effective Length 50 cm., Disc Dia. 40 mm. 357/08 Effective Length 60 cm., Disc Dia. 40 mm. (Please Mention Porosity of Disc Required in Column )