Adapter has a 1/4 " -28 thread that accepts a female luer lock adapter which provides a convenient way to connect solid phase extraction (SPE) cartridges, tubes, or syringes with a male luer lock fitting to a standard male taper inner joint. The adapter provides for easier sample concentration and clean-up while reducing the chances of cross-contamination. The addition of a 2mm PTFE stopcock between the luer joint and standard taper inner permits control of the vacuum source. Hose connection is 10mm OD at the largest serration. Supplied complete with 1 each CG-1055-20; 1/4 "-28 Female to Female luer lock adapter.