In order to help prevent overfill when transferring fluids into storage and transport drums, the Funnel King 2-gal. E-Z Smart Drum Funnel has a funnel extension that traps air at the top of the barrel. This trapped air stops liquid from filling all the way to the top of the barrel and leaves just enough room to add 2 gal.—the capacity of the funnel. Remove the funnel once fluid stops flowing freely.• Threaded bung connection helps prevent leaking Drum Funnel, 2 gal., 2-1/2 dia. Spout This product contains a chemical that is regulated under California Proposition 65. Warning This product contains a chemical known to the State of California to cause cancer. Warning This product contains a chemical known to the State of California to cause birth defects or other reproductive harm.