Cartridge Check Valve System Kit Back Catalog number: CTS-21011 Manufacturer: SCIENCIX Availability: In the manufacturer's stock Price on request - + Recommended 11-2570 Needle Seat Price on request 11-2525 1/4" Short Comp. Screw (Gold-Plated), 10/pk Price on request CTS-21219 Piston, Ceramic Price on request