Smaller is better. To prove it, Vml offers the OFP-2 series of overfill protection valves. Higher flow rates with less pressure. Compact design allows fit in virtually any spill containment pan. 140 GPM @ 30 PSI: CAUTION: The delivery truck pump must be equipped with a functioning pressure relief valve. Vml recommends not exceeding 30 PSI delivery pressure. The hydraulic shock of an overfill shut-off may damage connecting hoses if excessive pressure is used. One Valve, Any Tank: Product flow into the tank is shut down completely at any tank level desired. The shutdown level is set by suspending the Float Actuated Pilot Valve to the desired level in the tank from the tank top.