Abstract: An embodiment of a forty foot long ISO shipping container is shown which has two gas portals fitted thereto, one portal being located in an uppermost stiffening groove or recess positioned in an end door of the container, and a second portal being located in a lowermost stiffening groove or recess located in the same end door. The uppermost portal is shown coupled to a fumigant introduction means in the form of a fumigant tank containing a source of liquefied fumigant reagent, a heater, an inlet fan and a gas hose located between each of these items and a further hose connected to the uppermost portal.