Plunger Seal Back Catalog number: CTS-21347 Availability: In the manufacturer's stock Price on request - + Recommended CTS-11141 ACQUITY SM Performance Maintenance Kit, 700005236 Price on request CTS-21171 Rotor Seal, H-Assy, 6 Port 2-Position Price on request CTS-21406 Peristaltic Pump Cartridge, WPS/AC Price on request