Metering device Seal Back Catalog number: 11-3830 Availability: In the manufacturer's stock Price on request - + Recommended 11-1239 Ferrule, 1/16", SS, 10/pk Price on request 11-3889 Needle Seat Assembly, 0.12mm ID Price on request CTS-A11095-02 UPLC Check Valve, Double Ball & Seat, 2/pk Price on request