Outlet Check Valve Back Catalog number: CTS-A121 Manufacturer: SCIENCIX Availability: 3 weeks Price on request - + Recommended CTS-21171 Rotor Seal, H-Assy, 6 Port 2-Position Price on request CTS-21089 Needle Seal (For pH 1-14, for operation up to 130 Price on request CTS-5669 Oil Seal Price on request