A capillary column is installed in a GC with a graphite ferrule and a nut. Two nuts are available: one with a slit and one without. The nut with a
slit can be removed from the column without removing the ferrule, while the nut without a slit features a compact design and rapid temperature
response. For the Nexis GC-2030/GC-2010/2010 Plus, GC-2014, and GC-2025, the nut without a slit is used at the side of the injection unit,
whereas the nut with a slit is used at the side of the detector.