Parker offers a complete range of check valves suitable for compressed air or liquid conveying systems that are used in many of today's major industrial markets. This range includes different versions with pre-calibrated or in-situ adjustable opening pressure and colour coding to identify the supply and exhaust circuits to avoid errors in the installation process. This range is available in plastic, brass, stainless steel or FDA nickel-plated brass. By making installation safer and more intuitive, installation costs are reduced.