SMART FUNNEL PREVENTS OVERFILLING OF BARRELS. WITH THE FUNNEL EXTENSION TRAPPED AIR STOPS THE LIQUID FROM FILLING TO THE TOP OF THE BARREL. IT LEAVES JUST ENOUGH ROOM TO ADD 2 GALLONS MORE TO THE BARREL WHICH IS THE CAPACITY OF THE E-Z SMART DRUM FUNNEL. IN ORDER FOR THE SMART FUNNEL TO WORK PROPERLY IT MUST BE REMOVED IMMEDIATELY WHEN FLUID NO LONGER FLOWS FREELY. THIS MEANS THE DRUM IS FULL AND CANNOT TAKE ANY MORE FLUID. FEATURES UL STYLE""MARGIN-TOP0PX; PADDING-TOP 5PX; PADDING-BOTTOM 5PX;"" POLYPROPYLENE BODY AND LID POLYETHYLENE AIR HOSE AND BAND OVERALL HEIGHT 13"" TOP OD WITH COVER 11-1/2"" TOP ID 11"" THREAD 2"" WARNING: This product can expose you to chemicals including lead which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65warnings.ca.gov -