Plumbing barb 3/8" Threaded to 3/8" ID hose. Common for faucets.
This thing was made with Tinkercad. Edit it online https://www.tinkercad.com/things/jKiMAfdhJPS
This thing was made with Tinkercad. Edit it online https://www.tinkercad.com/things/jKiMAfdhJPS