Plunger Seal Back Catalog number: CTS-21347 Availability: In the manufacturer's stock Price on request - + Recommended CTS-10686 Needle Seal, Vespel® Price on request CTS-21421 PM Kit, 1290 Binary Pump Price on request CTS-10396 Washer Thermo/Dionex™ Model: P1000, P2000, P4000 Price on request