Union, Connector, Tee, low pressure, 0.75 mm / 0.030 inches through hole with 10-32 screw threads. PEEK, round with an internal "T". ARE-Applied Research brand. 1 EA.
Join three pieces of tubing with similar 10-32 connectors. This "three-way T" union has an internal flow pattern and allows for 3 pieces of tubing to be joined into one flow or to split a flow.