The OPTO-22 part G4PB16H is an access mounting rack designed specifically for the G4 series. With head connect brain board compatibility, this rack allows for seamless integration of various 16-channel modules. Its high-quality construction ensures longevity and durability, making it perfect for demanding industrial applications. Whether you need to expand your existing system or build a new one from scratch, the G4PB16H provides a reliable solution for your automation needs.