Union, Connector Set, Tee, low pressure, 1.0 mm through hole with 1/4-28 screw threads. PEEK, round with an internal "T". Use with 1/8th inch capillary tubing. ARE-Applied Research brand. 2/PK.
These "Union" Tee's are used to connect PEEK or stainless steel tubing with the same connectors on all ends in the low pressures zones of HPLC systems. An internal "T" flow pattern is often used to split flow into two directions or to combine two streams into one.