Main Piston Seal Back Catalog number: 11-2588 Manufacturer: SCIENCIX Availability: 3 weeks Price on request - + Recommended 11-1602 Seal, Polyethylene, High Pressure, Piston Price on request CTS-10475 Sapphire Plunger Kit Price on request CTS-21171 Rotor Seal, H-Assy, 6 Port 2-Position Price on request