A pp quick connect fitting, as opposed to a quick-disconnect or quick-release fitting, provides a permanent seal to your tubing, making it much harder to remove. In a setting where you would need to disconnect the tubing from other tubing or filtration equipment on a consistent basis, a quick-release fitting would satisfy your needs. They have two different components that help them function: the coupling body and the insert. The insert connects with the coupling body, snapping together to make a watertight seal. To release the fitting, you simply press the latch and pull them apart.