Plunger Seal and Back Up Ring Back Catalog number: 11-4126 Manufacturer: SCIENCIX Availability: In the manufacturer's stock Price on request - + Recommended 11-3795 Sapphire Plunger w/Holder Price on request CTS-21421 PM Kit, 1290 Binary Pump Price on request CTS-10692 HPMV Gold Seals, 2/pk Price on request