Velocitrol Velocity Sensor Controller, 1/15# Reset Pressure Range, Reverse Acting, Uses "B" Type Supply Unit, For Normally Closed Damper and One Pipe Thermostats, 5/95% Humidity Rating, 40/130 Degree Temperature Range, Comes with Remote Sensor

Velocitrol Velocity Sensor Controller, 9/15# Reset Pressure Range, Direct Acting for Reheat Sequencing , Uses "C" Type Supply Unit, For Normally Open Damper and One Pipe Thermostats, 5/95% Humidity Rating, 40/130 Degree Temperature Range, Comes with Remote Sensor