Underground STI-P3® Double-Wall:
First issued in 1969, STI-P3® tanks feature a pre-engineered corrosion protection system
that has withstood the test of time. The P3® is the most successful underground steel storage
tank technology ever developed. It combines the strength of steel with a three-way protection
system: 100% solids polyurethane dielectric coating, electrical isolation and factory-installed
cathodic protection system using sacrificial anodes. STI-P3® tanks are UL-58 and UL-1746
compliant. Standard 10-year warranty with 30-year warranty available.