Gold Plunger Seal Back Catalog number: 11-4133 Manufacturer: SCIENCIX Availability: In the manufacturer's stock Price on request - + Recommended CTS-11149 Needle Seal O-Ring, 002 Kalrez Price on request 11-4121 Ceramic Plunger Holder Assembly, LC-10ADvp Price on request CTS-10566 Alliance Head Plunger Seal Kit, 2/pk Price on request