This is a stainless steel nipple with a 1/2″ Female NPT threading on one end and a 1/2″ hose barb on the other end.
The item may look different depending on the supplier, but functionally it will be the same.

California Proposition 65

Proposition 65 Warning: This product contains chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm.