Outlet Check Valve Back Catalog number: CTS-A121 Manufacturer: SCIENCIX Availability: 3 weeks Price on request - + Recommended CTS-A11133 Tube Assembly, Transducer to Check Valve Price on request CTS-21085 Rotor Seal, 6 port, -COH Price on request CTS-12013 Tungsten Lamp (1000 hr) Price on request