Check Valve Cartridge, 2/pk Back Catalog number: CTS-10600 Manufacturer: SCIENCIX Availability: 3 weeks Price on request - + Recommended 11-1598 Check Valve Assembly, Inlet Price on request 11-3795 Sapphire Plunger w/Holder Price on request CTS-12013 Tungsten Lamp (1000 hr) Price on request