Millex-GP Syringe Filter Unit, 0.22 µm, polyethersulfone, 33 mm, gamma sterilized. This item is a direct replacement for SLGP033RB in countries where restricted. Sterile Millex filter units are available in a larger 33 mm housing with either MCE, PVDF or PES membranes. The larger filter surface area increases flow rate and throughput.