Scienceware® high density polyethylene Jerricans have a unique spout with a built-in air vent for smooth pouring. The 20cm (8") long spout also retracts into the threaded collar to conserve shelf space. When stored, the collar is sealed by a leakproof screw cap. An extra hand grip on the bottom gives positive control when pouring. The 5 gallon Jerrican has a 1" (25mm) I.D. pouring spout; other sizes have 3/4" (19mm) I.D. spouts. Graduated in U.S. gallons and liters, the Jerricans have extra headspace for expansion of contents.