Tank Sump made of high quality fiberglass from advanced technology in the United States, the United Kingdom and Malaysia, resulting in a consistent thickness of fiberglass walls, strong and durable, not deformed by temperature or underground water pressure, can be used throughout the life of the service station. The sump is designed in 2 pieces, allowing for adjustment of the desired height, making maintenance convenient. The Entry Boot or waterproof rubber seal is resistant to water and Biodiesel and E85 fuels. The entire system is tested for leakage (with vacuum pressure) during installation before burying, ensuring that there is no leakage after the station is open for service.