Union, Application Air, Oils, Fitting Side A Connection Type Push-to-Connect, Fitting Side B Connection Type Push-to-Connect, Fitting Side A Tube Outer Diameter 3/8 in, Fitting Side B Tube Outer Diameter 3/8 in, Fitting Material Brass, Color Silver, Includes Pre-Applied Thread Sealant No, Maximum Operating Pressure 250 psi, Maximum Operating Temperature 160 Degrees F, Specific Fitting Shape Straight Connector, Release Type Ring, Finish/Coating Nickel Plated WARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov. - Nickel (Metallic)