The 21 Liquid Level Control from McDonnell Miller is designed for precise liquid level management in various applications. This unit features a durable construction and is suitable for use in both industrial and commercial settings. The 21 model operates efficiently within a temperature range of 32°F to 250°F and is equipped with standard 1/2" NPT connections for easy installation. It meets ANSI standards for safety and performance, ensuring reliable operation in demanding environments. Ideal for water treatment and boiler systems, the 21 Liquid Level Control provides peace of mind.