The 39 non-modulating float pilot is designed to operate an On-Off float valve. The differential between the level where the valve opens and the level where the valve closes, is adjustable. The standard configuration is for the pilot valve to close on high level and open at a low level.
The 39 pilot is used as the standard pilot on all non-modulating F-Type 5, 106 and 206 series float valves.
For more information on the Model 39: