Check Valve Cartridge, 2/pk Back Catalog number: CTS-A094 Manufacturer: SCIENCIX Availability: 3 weeks Price on request - + Recommended 11-1600 Check Valve, Secondary Inlet Price on request CTS-10757 High Pressure Seal Kit Price on request 11-2525 1/4" Short Comp. Screw (Gold-Plated), 10/pk Price on request