355 Chromatography Column "PSAW" With integral sintered disc and stopcock 355/01 Effective Length 15 cm., Disc Dia. 10 mm. 355/02 Effective Length 20 cm., Disc Dia. 15 mm. 355/03 Effective Length 30 cm., Disc Dia. 20 mm. 355/04 Effective Length 40 cm., Disc Dia. 20 mm. 355/05 Effective Length 40 cm., Disc Dia. 30 mm. 355/06 Effective Length 50 cm., Disc Dia. 30 mm. 355/07 Effective Length 50 cm., Disc Dia. 40 mm. 355/08 Effective Length 60 cm., Disc Dia. 40 mm. 355/09 Effective Length 75 cm., Disc Dia. 40 mm. (Please mention porosity of disc required in column)