The Westfall Model 2900 Variable Flow Static Mixer utilizes two in-line wafer type mixers: one fixed and one variable that adjusts incrementally to adapt to changing flow conditions. Featuring automatic modulation to maintain 3 psi, regardless of flow rate, this static mixer flattens head loss at maximum flow, while providing consistent mixing over a 20:1 turndown ratio. Available in sizes from 3/8-in. to 120-in. I.D., the fixed mixer has a 0.9 Beta ratio and the variable mixer has a 0.7 Beta ratio.