A training apparatus composed of pvc pipe used to train scent dogs to detect complex hazardous substances from an odor mixture having at least two separated component odors housed in at least two ventilated containers. At least two elbow shaped pipes having compartments, in which the containers reside. The apparatus further includes end caps securing the containers in the compartments. A two way clean out adapter pipe, having three openings, is connected to the elbow pipes, where separate odors, from separate explosive components situated in the separated containers, mix by diffusion and provide an odor mixture developed from the separated components. A drain assembly, having a drain cover, with holes is affixed on top of the drain assembly; allowing odor mixtures to rise up and out of the drain assembly, where the scent detecting dogs are trained to identify the explosive components.