3/8" Slip Lok Mist Coupling (no nozzle). Operating pressure is 45-150 psi.
Use this to connect 2 pcs. of tubing together. You need to purchase nozzle plugs if you are going to do this, as there is the 10/24 threaded opening that would need to be plugged up. Shown in the picture below.
This picture shows you the locking teeth on the inside, that grab the tubing. To release the tubing, simply press down on the orange collar and pull the tubing out.