Cartridge Check Valve Housing, 2/pk Back Catalog number: CTS-21010 Manufacturer: SCIENCIX Availability: In the manufacturer's stock Price on request - + Recommended 11-4052 Needle Seal, SIL-30AC, SIL-30ACMP Price on request CTS-10788-5 Needle Wash Frit, 5/pk Price on request CTS-5531-07 Solvent Bottle Filter, 7/pk Price on request