The Ideal H2O? John Guest fitting line offers a wide range of push-fit quick connect fittings for pure water applications. These fittings are the world?s first food quality push-fit fitting. They provide the quickest and most effective installations with the quality assurance you would expect. Pushing the tube into the fitting is all that is needed to produce an instant but permanent leak-proof connection. The fittings are just as easy to disconnect and re-use without the need for replacement parts.