5/8" Hose I.D.x1/2" MPT Brass Barb Insert. It is lead-free compliant, meeting public law 111-380. Suitable for hose clamp or crimp type ferrule, this one-piece brass insert ensures a positive connection with plastic tubing or rubber hose. With a temperature range of 32 to 200 degrees Fahrenheit and excellent vibration resistance, it offers reliable performance. Barb size is hose ID.
WARNING: This product can expose you to lead, a chemical known to the State of California to cause cancer and reproductive harm. www.P65Warnings.ca.gov