Murray Hallam, one of the leaders in aquaponics, demonstrated these EZ Release Fittings in his videos. When it comes to plumbing in an aquaponics system, getting your pipe layout right BEFORE gluing is critical. One way to make life a whole lot simpler, is to use the fittings at the crucial points in your system.
Alan Berstein of the Aquaponics Source did a video showing how to use them in a system. A pretty good idea to check these out and have some on hand when building your system or to retrofit and existing system.