GC interface assembly

A GC interface assembly for a heated transfer line of a gas chromatography interface probe, the heated transfer line comprising an inner tube and an outer tube, the GC interface assembly comprising:

• a GC fitting securable to said inner tube, the GC fitting comprising a first section comprising a substantially cylindrical projection for fluid connection to a GC source in use, and a second section having a larger radius than the first section in at least one direction, the second section being provided with at least one flat;
• and
• a GC end cap securable to an outer tube, the GC end cap comprising an aperture shaped to substantially correspond to the second section of the GC fitting, the aperture having at least one flat to correspond to the at least one flat on the second section of the GC fitting, which aperture slidably receives the second section of the GC fitting in use such that the GC fitting is substantially constrained to linear movement with respect to the GC end cap and rotation of the GC fitting relative to the GC end cap is substantially prevented.