Big Horn 11269 2-1/2-Inch By 1-Inch Stepped Hose Adapter Adapts hose to portable or stationary power tools Made of flexible rubber OD fits 1-1/4, 1-1/2, 2-1/2-Inches ID fits 1, 1-1/4, 1-1/2, and 2-incues For best connection use hose clamps (not included)