The manufacturer of the EV700 Automated Switching Valve is Rheodyne. The Rheodyne EV700 Automated Switching Valve is a high-performance valve designed for use in liquid chromatography systems. It features a unique, patented design that allows for fast and reliable switching between multiple columns or sample streams. The valve is fully automated, allowing for easy integration into existing chromatography systems. It also offers a wide range of flow rates and is compatible with a variety of solvents and samples.