Get current pricing for Watson Marlow, 323E/D Watson Marlow Model 323e/d Pump 400 Rpm Us. Peristaltic Pump. Flow Rates From 0.45 To 2000 Ml/min (0.007-31.7 Gph).large Clear Lcd Display With Accura . Product Category: Lab Equipment, Sub Category: Pumps (peristaltic):