ACQUITY I-Class SM-FTN Performance Maint. Kit,2890 Back Catalog number: CTS-21240 Availability: In the manufacturer's stock Price on request - + Recommended CTS-11297 Sapphire Plunger Price on request CTS-8068 Quartz Lens Price on request CTS-A11431-02 Cartridge Check Valve Housing, 2/pk Price on request