Next Generation has a unique top pump protector that protects the drive unit, meter, hose assembly and other top fittings.Features include:UN/DOT certified for Packing Group II and III materials per 49 CFR.Top unload only for optimum safety.Domed bottom with sump for complete drainage.2" replaceable bung for fitting or optional pressure relief valve.Tie down lugs.Stackable to 3 high.