Abstract: A pass through closure and delivery device permitting material to be safely passed through a slot in a partition or prison cell door. A container having first and second openings and first and second doors associated with each opening is disclosed for mounting on a partition or cell door having a slot therethrough. Each door on the container includes a latch that is operable from only one side of the cell door. A cam-operating attaching mechanism allows the container to be releasably mounted to a pair of track members affixed to the cell door with the slot therebetween. Using the pass through delivery device and the method of the present device, food or other materials can be safely delivered to an inmate inside a locked cell by mounting the container of the pass through delivery device on the cell door with one of the openings adjacent the first door covering the slot in the partition.