Cartridge Check Valve System Kit Back Catalog number: CTS-21011 Manufacturer: SCIENCIX Availability: In the manufacturer's stock Price on request - + Recommended CTS-A11133 Tube Assembly, Transducer to Check Valve Price on request 11-1602 Seal, Polyethylene, High Pressure, Piston Price on request CTS-5531-07 Solvent Bottle Filter, 7/pk Price on request