2-port air stone stainless steel sparger assembly is designed for the sparging of gases into the vessel liquid media. This design allows access through the side arms with a screw on cap assembly. Fully autoclavable. Sparger assembly for 6l l/p over head drive vessel Fits thru a 45mm sidearm 316l SST sparger tube is 15? long with 12mm glass frit. Course porosity 40-60 microns 32 ra material finish or better