Check Valve Cartridge, 2/pk Back Catalog number: CTS-10493 Manufacturer: SCIENCIX Availability: 3 weeks Price on request - + Recommended CTS-21586 1100 Series Essential Pack, G1310A/G1311A Pump Price on request CTS-10476 Sapphire Plunger, Alliance Price on request CTS-10340 Plunger Seal Price on request