Honeywell L408J1033 SPDT Vaporstat Pressure Control 0-4 PSI Mercury Free

The Honeywell L408J1033 is a mercury-free SPDT (single pole, double throw) vaporstat pressure control designed for steam heating systems and low-pressure applications. This precision control operates in the 0-4 PSI range, making it ideal for monitoring and controlling vapor pressure in boilers and steam systems.

Key Features:

• SPDT switching configuration with "makes on rise" (RW) operation
• Mercury-free design for environmentally safe operation
• Adjustable pressure range from 0 to 4 PSI for precise control
• Snap-acting switch mechanism for reliable performance
• Direct replacement for legacy Honeywell L408B1149 model
• Compact design for easy installation in tight spaces

This vaporstat is commonly used in residential and light commercial steam heating systems to control burner operation based on system pressure. The mercury-free construction meets modern environmental standards while maintaining the reliability Honeywell pressure controls are known for. The device features a diaphragm-actuated switching mechanism that provides accurate pressure sensing and dependable switching action.