Cartridge Check Valve Housing, 2/pk Back Catalog number: CTS-21010 Manufacturer: SCIENCIX Availability: In the manufacturer's stock Price on request - + Recommended CTS-12016 Compression Screw, 1/16", SS, 10/pk Price on request CTS-A11372 Tube Assy, Transducer to Check Valve, I2V Price on request CTS-21095 Seal Wash (0.0787 ID, Fixed, Bio), 2/pk Price on request