Check Valve Cartridge, 2/pk Back Catalog number: CTS-10493 Manufacturer: SCIENCIX Availability: 3 weeks Price on request - + Recommended CTS-A157 Outlet Check Valve Price on request CTS-A11374 Tube Assy, SSV to I2V Price on request CTS-10285 TFE 3-Way Valve 4 (V4) Price on request