Eaton Weatherhead 3200X6X4 Brass CA360 Fitting, Adapter, 3/8" NPT Female x 1/4" NPT Male Adapts 1/4" NPT male to 3/8" NPT female Brass for corrosion resistance, ductility at high temperatures, and low magnetic permeability For use with LP and natural gas, refrigeration, and hydraulic applications Refer the Guide on how to measure ID for Fluid Ports and Connectors