The 51S-2M-HD Head Mechanism by Verne Simmonds Co McDonnell Miller is a high-quality component designed for precise water level control in boiler systems. Constructed from durable materials, this head mechanism ensures longevity and reliability in demanding environments. It meets industry standards for safety and efficiency, making it an essential part of any heating system. The 51S-2M-HD is compatible with various models, providing versatility for maintenance professionals. Upgrade your boiler system with this reliable head mechanism to ensure optimal performance and safety.