If you are looking for the rugged poly tank, look no further. Hastings Equity brings you the most rugged Round Poly Stock Tank on the market. It features a closed-lip design that is incredibly strong and won't buckle to crowding livestock. Each tank is made of 100% high density virgin polyethylene so tanks won't rust or corrode. In addition, these tanks are resistant to feedlot acids and UV damage. A drain plug is included and the tanks have a 3 year warranty for material and workmanship. Dimensions: 320 gal = 6' x 2', approx. weight: 55 lbs580 gal = 8' x 2', approx. weight: 83 lbs1, 100 gal = 10' x 28", approx. weight: 135 lbs | Hastings Equity Round Poly Stock Tank | Size 580 gal