Dee Zee Auxiliary Tanks - A safe and convenient means for transporting non-flammable liquids. Auxiliary tank can be connected to gravity flow kit to syphon fuel directly into your vehicles diesel gas tank (sold separately). Constructed of heavy gauge steel. Black powder coat finish. Radius curve design eliminates key weld pressure points. Tanks feature stability baffles, lockable cap, 3/8 in. drainage plug, and venting coupler. Tanks are intended for private use (non-commercial). Not designed for use as an auxiliary fuel system. Hydrostatically pressure tested to meet Federal Motor Carrier Safety Administration requirements for auxiliary tanks. Meets Federal DOT requirements for UN31B tanks. Connector kits to feed diesel directly into your fuel line sold separately (DZ97960 & DZ97961).