The Hays Cleveland R-09400-B0 Master Regulator is a compact single-unit sensing/controlling/positioning unit. It mounts in any position in a small space and provides continuous maximum firing rate selection, as well as remote manual or automatic operation and remote position indication. It is ideal for many small or rudimentary combustion control and process applications, whether steam pressure or hot water temperature systems. It can be used to position fuel valves or combustion air dampers or both. Several standard pressure/ temperature ranges are available. Please see also Hays Cleveland Standard Linkage.