Check Valve Cartridge, Ceramic Ball & Seat, 2/pk Back Catalog number: 11-2401 Manufacturer: SCIENCIX Availability: 3 weeks Price on request - + Recommended 11-1601 Seal, GFP, High Pressure, Piston Price on request CTS-21577 PM Kit, G1367E Price on request CTS-21586 1100 Series Essential Pack, G1310A/G1311A Pump Price on request