Keep the concept seeking excellence, Ryan try our best to create more value for you with products and service.Ryan external gear pumps are produced in 9 different versions. Pressure: Ryan offers three pressure ratings, E, F and G. Efficiencies: volumetric efficiency up to 98%, mechanical efficiency up to 93%. Mountings: flanges, shaft ends and ports. Seals: viton, buna and EPR seals is available. Integrate: all pumps can be odered with relief valve and check valve