Quickly and safely swap out air tools with Universal Coupler. When paired with matching plug, provides quick tool change without need to shut off air supply. Internal valve spring safely shuts off air flow when disconnected from plug, preventing air leaks. 6-in-1 Universal Coupler features automatic, push-to-connect compatibility including Industrial Interchange (M-Style) and High Flow (V-Style) plugs. 3/8" body size.