or a DMX model 221 dosing pump

The impeller is a VORTEX impeller for 35 mm free passage suitable for pumping surface water

for example

DDA 12-10 AR-PVC/T/C-F-31U2U2F The SMART Digital DDA is a compact positive displacement

DDA 200-4 AR-SS/V/SS-F-31A3A3B The SMART Digital DDA is a compact positive displacement

dda 60 10 fcm pv v c f 31u3u3fg 99159381 or a DMX model 221DDA 60 10 FCM PV V C F 31U3U3F The SMART Digital DDA is a compact positive displacement, diaphragm dosing pump with variable speed drive (PMS motor) and intelligent control electronics with minimum energy consumption. The SMART Digital Dosing series operates at full stroke length to ensure optimum accuracy, priming and suction, even for high viscosity or degassing liquids. The duration of each discharge stroke varies according to the capacity set,