This PYREX® gas dispersion tube with fritted disc has a coarse porosity (40 to 60µm) fritted disc at an angle of 90° and is used to disperse or scrub gas in liquids. The approximate overall dimension across the disc and stem is 35mm for a 20mm disc. Dimesions: (H x Body O.D.) 250 x 35mm. Disc Diameter: 20mm. Porosity: Coarse. Disc Angle: 90°. Material: Borosilicate Glass Code 7740. Corning® #: 39525-20C.