Face Seals, 4/pk Back Catalog number: CTS-10989 Manufacturer: SCIENCIX Availability: 3 weeks Price on request - + Recommended CTS-21011 Cartridge Check Valve System Kit Price on request CTS-11315 Needle Seal, PEEK™ SIL-20 Price on request 11-2529 Screw, Comp., 10-32, 304SS, (Gold-Plated), 10/pk Price on request