The Reliance Water Controls (RWC) Pressure Relief Valves are available in many different pressure ranges and sizes, making them suitable for all applications. Sizes are available from 1/2” up to 2” inlets, with the 1915 Range having larger outlet sizes ranging up to 2 1/2”. All Reliance Water Controls (RWC) Pressure Relief Valves come pre-set to a specific pressure and are non-adjustable. At Advanced Water we can offer many different variations of Pressure Relief Valve, including older Valves such as the H50 and H75.