Tees
151F-8-6 Male Tube to Pipe Run Tee. 1/2" x 3/8". 45 Deg Flare x Male Pipe. Brass
Choosing this unbranded version means you skip the brand tax entirely.
Parker 224-8 3/8" Barb Brass Union Tee
A nice touch is the ergonomic shape Parker designed into this unit.