Cartridge Check Valve Housing, 2/pk Back Catalog number: CTS-21010 Manufacturer: SCIENCIX Availability: In the manufacturer's stock Price on request - + Recommended CTS-21406 Peristaltic Pump Cartridge, WPS/AC Price on request CTS-10711 Alliance Head Plunger Seal Kit, Black, 2/pk Price on request CTS-A094 Check Valve Cartridge, 2/pk Price on request