The Model OFP-3 has been enhanced! Now, the OFP-3 series of valves not only have the highest flow rating in their class, the low flow - low pressure characteristics have been modified to accommodate virtually any delivery truck pump! The OFP-3 valves have the following flow ratings:7 PSI minimum operating pressure; 10 - 400 GPM. Product flow into the tank is shut down completely at any tank level desired. The level is set by suspending the Float Actuated Pilot Valve to the desired level in the tank from the provided Bushing. Because of the float - pilot valve actuation system used; hydraulic shock is minimized.