For fine dispersion. Porous tip approximately 5mm or 7mm O.D. x 10mm. 7mm O.D. Tube fits #7 Ace-Thread. Offered with Porosity A (145-174 micron), Porosity B (70-100 micron), Porosity C (25-50 micron), Porosity D (10-20 micron), or Porosity E (4-8 micron).