Eaton Weatherhead 1064X6X6X4 Brass CA360 Mini-Barb Brass Fitting, Union Tee, 3/8 x 3/8 x 1/4" Tube OD (Pack of 20) Joins two 3/8" OD plastic tubes at 90-degree angles to a third 1/4" OD plastic tube Brass for corrosion resistance, ductility at high temperatures, and low magnetic permeability For use in low-pressure air, coolant, and vacuum applications