of turn for handle 12 in order to reach the u201c on u201d and u201c off u201d positions and may further be used to indicate the precise limits of rotation travel represented by these positions it will also be seen that set screws 20 serve to hold handle 12 in place within barrel housing 24 although two set screws 20 are used in the preferred embodiment alternative embodiments could well use any other number of set screws 20 referring now to fig3 and 4 the method of moving the preferred embodiment of the invention between inflation mode and deflation mode may now be described the device is shown in inflation mode in fig3 cap 14 is rotated along its threads to fit tightly against the dorsal end of handle 12 on diffuser 26 at cap o ring 30 thereby sealing vents 62 on diffuser 26 closed from the outside air because air cannot flow through vents 62 compressed air entering air hose connector assembly 18 and passing into the bore of the device may instead flow in the direction of arrow a through barrel 10 barrel extension 16 through bag valve connector assembly 17 and into a previously deflated or previously unused dunnage bag not shown fig4 depicts the preferred embodiment of the invention in deflation mode as shown in the figure cap 14 is open with respect to handle 12 that is threaded outwardly on diffuser 26 to the extent of its travel as limited by cap screw 28 thereby allowing vents 62 on handle cap diffuser 26 to be exposed to the outside environment thus as air travels from the compressed air source and.