The Big Horn 11402 is a 4 Inch Shop Vac Adapter. Connect 4 Inch hose to 2-1/4 Inch shop vac accessories. Features: * Connect 4 Inch hose to 2-1/4 Inch shop vac accessories * Made of ABS plastic * Many applications * Use with shop vac system * For best connection use hose clamp (not included) What"s In the Box: * Big Horn 11402 4 Inch Shop Vac Adapter