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-21089 Needle Seal (For pH 1-14, for operation up to 130 Price on request CTS-10324S Seal Pack w/Needle Price on request CTS-21010 Cartridge Check Valve Housing, 2/pk Price on request