ACQUITY I-Class SM-FTN Performance Maint. Kit,2890 Back Catalog number: CTS-21240 Availability: In the manufacturer's stock Price on request - + Recommended 11-1599 Check Valve Assembly, Outlet Price on request CTS-21463 Check Valve Cartridge, Ceramic, 2/pk Price on request CTS-5531-07 Solvent Bottle Filter, 7/pk Price on request