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Corrosion protected steel single and double-wall underground storage tanks. Sti-P3 tanks are proven performers in a wide range of applications from gas stations to home heating oil tanks to residential and commercial use for back-up generators. All Sti-P3 tanks are compatible with alternative fuels and are backed by a 30-year warranty against internal and external corrosion. Only tanks manufactured by STI licensees, built to STI standards and subjected to extensive quality assurance programs can bear the STI label.