McDonnell & Miller 421-30 Boiler Control Float

McDonnell & Miller 421-30 Boiler Control Float provides reliable, float-based control for compatible boiler systems. This Type Float control is designed for use on the 25-A Series Water Feeder and the 27-W Series Liquid Level Control, and it includes a gasket for a secure, leak-free seal. Engineered for easy replacement within McDonnell & Miller boiler assemblies, this float control helps maintain accurate water levels, reduces operator adjustments, and contributes to safer, more efficient boiler operation across light commercial and residential settings.

• Compatible with 25-A Series Water Feeder
• Compatible with 27-W Series Liquid Level Control
• Type Float design for reliable level sensing
• Includes gasket for quick, leak-proof installation
• McDonnell & Miller parts compatibility for easy maintenance

Keep this component in your service kit to ensure consistent performance and dependable boiler operation over time.