I figured it out. Ok, someone showed me. Like most of these couplings, you just have to find the right place to squeeze. In the case of this coupling, the release to squeeze is on the back side of the coupling as its pictured. In my defense, I was holding the tank up with one hand and a flashlight in my mouth. Lol. Buddy walks in my garage and reaches in with one hand and wiggles it right off. Ugh!