From smallest round and round end tank to 11 ft. round units, all are built with the same heavy-duty construction for durability. All feature 1 1/4" BIG TOP rims...with sidewalls and bottoms made of 20 gauge galvanized metal fully locked, swaged, corrugated, welded and sealed. Tank features fully seamed Pittsburgh lock bottom | Hutchison Western Drinker Round End Stock Tank | Size 100 gal