Black Plunger Seal Back Catalog number: CTS-6613 Manufacturer: SCIENCIX Availability: 3 weeks Price on request - + Recommended 11-4126 Plunger Seal and Back Up Ring Price on request CTS-21010 Cartridge Check Valve Housing, 2/pk Price on request CTS-A11133 Tube Assembly, Transducer to Check Valve Price on request