Serrated tubulation molded in one piece with bottle, for strength and leak resistance. Outlet low on bottle for more complete drainage. Convenient wide shoulder handles for easy carrying. Are also graduated to deliver in 1-gal. and 5-L increments. 10- and 20-liter sizes take 1/2-in. (13mm) I.D. tubing. A hose clamp should be used when attaching tubing to ensure a tight fit and avoid leaking. Screw cap opening also accepts #13.5 stopper. NOTE: For best results, autoclave using a properly vented closure.