Valco fused silica adapters allow the use of fused silica tubing in 1/16" and 1/32" fitting details. One piece adapters are generally used in fittings, while the two piece are better for valves.
The 1/32" low mass external union is specially designed for use with capillary columns in GC.
This self-compensating nut is a direct replacement for the standard nut on the split/splitless injectors of Agilent GCs.
The make-up adapter connects a capillary column to a valve or detector while adding a make-up gas.