Abstract: A container having a floor with an upper inner face and a lower outer face is provided with a drain having a tubular housing extending between the faces and a partition formed with a hole, subdividing the housing into an upper compartment and a lower compartment, and forming at the hole an upper valve seat and a lower valve seat. Respective floatable upper and lower valve bodies in the compartments sealingly engageable with the respective valve seats. Thus with this system when the upper compartment fills with liquid it floats up the upper ball to unblock the hole in the partition and let this liquid drain out. If, however, water rises in the lower compartment, it will float up the lower ball to block the passage and prevent this liquid from flowing up through the passage into the container.

Abstract: An insulated freight-transport container has a pair of longitudinally extending and parallel side walls, a top wall bridging the side walls, a front end wall bridging the side walls and connected to the top wall, and a rear end wall formed by a sill and a lintel attached to the top wall and defining a door opening therewith. A pair of doors are engageable with the opening to close same and a floor is formed of upper and lower skins and a body of insulation therebetween. The floor extends horizontally longitudinally from the door sill to the front end wall and bridges the two side walls. It is recessed below an upper edge of the door sill. A plurality of longitudinally extending rails fixed to the top door skin define a plurality of longitudinally extending air-conducting passage and have an upper surface level with the upper edge of the door sill.