Check Valve Cartridge, Ceramic Ball & Seat, 2/pk Back Catalog number: 11-2401 Manufacturer: SCIENCIX Availability: 3 weeks Price on request - + Recommended CTS-12016 Compression Screw, 1/16", SS, 10/pk Price on request CTS-21010 Cartridge Check Valve Housing, 2/pk Price on request 11-3883 Needle Assembly Price on request