Abstract: An apparatus for safely delivering a hazardous fluid substance to a receiving structure includes first and second supply cylinders containing the fluid substance and each supply cylinder having a supply cylinder release port; a high pressure containment vessel having a vessel wall and being sized to receive and safely enclose the first and second supply cylinders; a high pressure first tube extending from each of the first and second supply cylinders, and in fluid communication with the supply cylinder release ports and extending to and being in fluid communication with a vessel port in the vessel wall; and a vessel valve in fluid communication with each of the first tube for controlling delivery of the fluid substance from the first and second supply cylinders and from the vessel.