Accurate Pressure Control: Fixed set at

the 305931 provides the real-time temperature data required to verify system setpoints and ensure peak efficiency

Key Benefits Precise Compatibility: Engineered as a drop-in replacement for Barber Colman AT-11-399 and AT-24-399

The C3 radial internal clearance is specifically designed to accommodate thermal expansion in high-temperature environments

The Ranco J10-821 Humidistat is a professional-grade mechanical control engineered for precise relative humidity management in residential and light commercial HVAC systems

McDonnell & Miller 250-3/4-15 Valve Els PW 17895 Accurate Pressure Control: Fixed setThe McDonnell & Miller 250 3 4 15 is a high performance 3 4" NPT Pressure Relief Valve engineered for critical over pressure protection in hydronic heating systems and storage tanks. Featuring a robust bronze body and seat, this valve is factory set at 15 PSI with a substantial thermal discharge capacity of 515,000 BTU hr. Designed to meet ASME Section IV code requirements for heating boilers, it utilizes an EPDM rubber diaphragm and seat disc to