The Atkinson Overfill Prevention valve is one of our well known products that has been available from Atkinson Equipment and Fueldump for many years. It has a prooven track record with an impecible non failure rate. It is a unique device that actually stops the tank from being overfilled rather than just giving a warning to the tanker driver to stop filling. The overfill prevention valve will allow fuel to pass through it untill the maximum level is reached at which point it isolates and there for stops the tank from being overfilled. The overfill prevention valve is available for both plastic and steel fuel storage tanks.