Parker's keyed and color coded coupling series are industrial quick coupling systems developed for low pressure and vacuum fluid applications and their performance and safety requirements. This product range is ideal for connecting all types of fluid lines, even those as diverse as liquids, gases and media.These coupling systems have two levels of safety: the keyed coding between coupling and nipple offers a guarantee to avoid confusion between fluids when connecting, which is complemented by colour coding to identify the fluids and/or pressure lines . The keyed and colour coded couplings have standardised dimensions, making them interchangeable and easy to install in a wide range of configurations and markets for industrial fluids.