ACQUITY H-Class QSM Performance Maintenance Kit Back Catalog number: CTS-11335 Manufacturer: SCIENCIX Availability: 3 weeks Price on request - + Recommended CTS-21089 Needle Seal (For pH 1-14, for operation up to 130 Price on request 11-2401 Check Valve Cartridge, Ceramic Ball & Seat, 2/pk Price on request CTS-21586 1100 Series Essential Pack, G1310A/G1311A Pump Price on request