These Dee Zee liquid transfer tanks are constructed from 14 gauge steel, protected by NRT (No Rust Technology) rust inhibitor powder coat finish. Radius curve design eliminates key weld pressure points. Feature 3 stability baffles, lockable cap, .375" drainage plug, and venting coupler. These liquid transfer tanks are intended for private use (non-commercial). With most of these liquid transfer tanks, it is unsafe (and illegal) to transport flammable liquids in. However, a select few models have been redesigned and certified for fuel transportation, and can use an optional connector be directly integrated into your vehicle's fuel system, extending your driving range.