Johnson Controls T 4002 304 Conversion Kit 318973 401 Vibration Reduction: Factory balanced design prevents Vibration Reduction: Factory balanced design prevents mechanical stress on the blower motor and housing Factory Precision: Explicitly designed as a drop in replacement for the 056717101 part number to ensure exact fitment Precise Modulation: Proportional output signal provides accurate control over pneumatic actuators based on specific space secondary loads Key Benefits Universal Compatibility: Engineered to convert various competitor two pipe pneumatic thermostats to the high performance Johnson Controls T4000 platform