Boss Buck Non-Typical 55 Gal. Poly-Lower Unit fits 55 gallon barrels both metal and plastic. The extra long 12" feed tube is double the length of our 6" steel lower unit. Choose from the 3-way for three ledged feeders or the 4-way for four ledged feeders. The wagon wheel design in the top gives this unit rigidity and flexibility. The design keeps the funnel unit from changing shape when 300 lbs. of feed is put on top of it. This unit is weather rust and leak proof. This maintenance free unit will provide years of trouble free use. This unit is built to be outside 24-7 365 days! 22 3/8" O.D. (Outside Diameter) on the funnel.