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The AR553/U is a multi-purpose, pressure-operated switch manufactured by Aparature. This switch is designed to detect changes in pressure and react accordingly. It is commonly used to detect and measure flow and pressure within a range of applications such as engines, refrigeration, ground support, and aerospace systems. The AR553/U offers accurate, reliable performance and is easy to install and use. The switch is constructed of durable materials, which increases its reliability and efficiency, and features a variety of customization options. It is available in a variety of voltage and current configurations, making it suitable for a wide range of applications.