Delavan 7900C Cast Iron Roller PumpDelavan Roller Pump Model: 7900C Delavan designs, engineers and manufactures a wide variety of roller pumps to meet the widest ranges of low volume, moderate pressure pumping applications. To ensure the best performance for your investment, we incorporate such features as "Ultra" rollers, heavy duty sealed bearings, Viton seal rings, stainless steel shafts and rotors, and close tolerance machining. All are standard. Features: Max flow: 22. 5 gpm Max