Sparging accessory for vertical sidearm spinner flasks. Manufactured from 316l stainless steel with electropolish finish. Includes polypropylene cap with 1/4? white compression fitting and white silicone gasket. .040 inch hole for aeration of fermentation cultures where shear force is less critical. Dimensions: 18 1/2"x 4 3/4" x .250 .040? hole