Wikipedia
Y-Set (intravenous therapy)
In intravenous therapy a Y-Set, T-Set and V-Sets are Y, T and V shaped three-way connector sets made of connecting plastic tubes used for delivering intravenous drugs into the body from multiple fluid sources. As Y-Sets are the most common shaped sets, Y-Set is a name that is sometimes used to represent the family of connector sets (sometimes called Y-tubes). The majority of these infusion sets have a left and right hand line that deliver fluid and drugs (often via a valve) to a short common limb attached to the female fitting on the intravenous cannulae.