Check Valve Cartridge, Ceramic Ball & Seat, 2/pk Back Catalog number: 11-2401 Manufacturer: SCIENCIX Availability: 3 weeks Price on request - + Recommended CTS-10493 Check Valve Cartridge, 2/pk Price on request CTS-10711 Alliance Head Plunger Seal Kit, Black, 2/pk Price on request CTS-10396 Washer Thermo/Dionex™ Model: P1000, P2000, P4000 Price on request