The G2913A Injector/Tower will work in tandem with the G2614A Autosampler, injecting the samples in its turret. There are several types of turrets which can carry different amounts of vials. Up to two G2913 Injectors/Tower can be installed at once in a GC.
It’s part of the Agilent 7683 Automatic Liquid Sampler.

It’s installed on top of one of the GC Inlets.