Plunger Seal Back Catalog number: CTS-21347 Availability: In the manufacturer's stock Price on request - + Recommended 11-4073 LC-30AD Plunger Holder Assembly, UHP2 (w/Diaphragm Price on request 11-3834 Pump Seal, PE Price on request CTS-A11431-02 Cartridge Check Valve Housing, 2/pk Price on request