Abstract: A valve for an airtight flexible container such as a dunnage bag including a bowl with openings and extending through an opening in the container A flange around the rim of the bowl is heat welded to the container around the opening. One end of a housing is screwed into the rim of the bowl. A cap is removably press fit onto an opposite end of the housing. A spider extending across the housing supports a plug which is spring mounted on the spider and biased to close the lower end of the housing by compressed air in the container. Compressed gas inside the container is released by removing the cap and pressing on the plug to dislodge the plug from its seat on the one end of the housing or by unscrewing and entirely separating the housing from the bowl.