Get current pricing for Marlen, Opti 340 Max. Capacity = 34,000 Lbs/hr @ 66 Gpm. Max. Product Pressure = 250 Psi. 130340 - Pump #4 - Hye/pum4873 - Hydraulic Unit Model 631-2071, 631102 . Product Category: Process Equipment, Sub Category: Process Pumps: