Piston Seal Wash Seal/Priming Valve Seal Back Catalog number: 11-2587 Manufacturer: SCIENCIX Availability: 3 weeks Price on request - + Recommended CTS-21347 Plunger Seal Price on request CTS-21421 PM Kit, 1290 Binary Pump Price on request 11-4152 Tubing D-L Assembly Price on request