Nalgene 2302 LDPE Carboys with Tubulation and Closure. These carboys have a serrated tubulation molded in one piece with body, for strength and leak resistance. Outlet low on bottle for more complete drainage. Three largest sizes (Cat. No. 2302-0020, 2302-0050 and 2302-0130) have convenient wide shoulder handles for easy carrying and are graduated to deliver, in 1-gallon and 5-liter increments. A hose clamp should be used when attaching tubing to ensure a tight fit and avoid leaking.