Boss Buck Protein Lower Unit Poly 6in w/ 3 Way Head. Poly-Lower Unit fits 55 gallon barrels both metal and plastic. The unit has a 6 down spout. Choose from the 3-way for three legged feeders or the 4-way for four legged feeders. 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 Extra deep funnel design adds feed capacity to your 55 gallon drum. 22 3/8 O.D. (Outside Diameter) on the funnel Funnel without gravity head is 18 1/2 deep Specifications for Boss Buck Protein Lower Unit Poly: Manufacturer: Boss Buck Additional Features: 3 Way Head Condition: New Package Contents: Boss Buck Protein Lower Unit Poly Boss Buck BB-1.9P.3: Protein Lower Unit Poly 6in w/ 3 Way Head