Union, Connector, Tee, low pressure, 0.8 mm / 0.031 inches through hole with 1/4-28 screw threads. PEEK, round with an internal "T". ARE-Applied Research brand. 1 EA.
Join three pieces of tubing with similar 1/4-28 connectors. This "three way Tee" union allows for 3 pieces of tubing to be joined into one flow or for one flow to be split.