Agilent Technologies Agilent 1260 Infinity System User's Manual page 18

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The Agilent 1260 Infinity Binary LC - Product Description
System Components
Figure 4
Up to three TCC can be "clustered" to allow advanced applications such as
switching between eight columns for automated method development or to
make additional columns available for different applications. Thus, the
column to be used becomes a simple method parameter. This requires two
8 position/9 port valve heads, one each in two of the TCCs. Clustered TCC
are represented by the software as one unit with one interface for ease of
operation.
Further improvements compared to earlier designs include better thermal
insulation, better capillary guides and a "door open" sensor so that
methods can define that the door must be closed – especially useful for
low or high- temperature methods.
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Quick change valve in TCC
1260 Infinity Binary LC - System User Guide