The Rinnai RE199e Water Heater By Pass Servo Assembly (MZ38) is a high-quality unit designed specifically for Rinnai water heaters. Made in Japan, this assembly is compatible with the Rinnai RE199e model and operates at 120V. With its servo design, this unit allows for easy installation and reliable performance, ensuring efficient heating in your home. This product, consisting of four units, is a crucial component for maintaining the functionality of your Rinnai water heater system.