Pressurizers are pre-engineered pressure booster packages that increase system pressure and maintain the flow necessary to meet changing system demands. The constant pressure feature is unique and sets Thrush DCPs apart from other booster packages. Constant pressure on the top floor of a building ensures not only adequate flow but also, the efficient operation of water use fixtures and appliances such as flush valves, washdown bowls, dishwashers, washing machines and shower heads. Pressure boosting, without constant control of pressure, will causedemand pressure fluctuations. This will result in either too little or too much operating pressure at critical fixtures and appliances resulting in improper operation.