Black Plunger Seal Back Catalog number: CTS-6613 Manufacturer: SCIENCIX Availability: 3 weeks Price on request - + Recommended CTS-10548 Gold Plunger Seal, Analytical Heads Price on request CTS-21567 PM Kit, Seal Wash for Binary Pump G4240A Price on request CTS-10711 Alliance Head Plunger Seal Kit, Black, 2/pk Price on request