The HUNSAKER 5 Gallon QUIKFILL Fuel Jug has a 1.00" I.D. x 1.25" O.D. threaded pour spout. The pour spout is designed to work with a 1.25" I.D. hose, which simply clamps down over the top of the spout. The full-length gripping handle has a 1-3/8 I.D. vent opening which allows fluid to pour quickly and smoothly. The breather opening in the vent handle also works as a fill location for filling up your QUIKFILL.