Check Valve Cartridge, 2/pk Back Catalog number: CTS-A094 Manufacturer: SCIENCIX Availability: 3 weeks Price on request - + Recommended CTS-21219 Piston, Ceramic Price on request CTS-11265 Kit S200 Standard Pump Seals Price on request CTS-A11342 Tube Assembly, Transducer to Check Valve Price on request