Eaton Weatherhead 1068X4X4 Brass CA360 Mini-Barb Brass Fitting, Adapter, 1/4" Tube OD x 1/4" NPT Male (Pack of 5) Adapts 1/4" NPT male end to 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