Tru-Flate T-Style design coupler plug is wider than other interchanges. Widest metal section between the groove and pilot. Design: Tru-Flate Thread Size: 3/8" MNPT Material: Steel Pressure Rating: Air Rating: For Use With: 13-600 Series Part Numbers WARNING: Handling this product can expose you to Lead a chemical 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 Wash hands after handling. - Nickel (Metallic)