Abstract: A plastic pail lid opening surrounded by an upstanding closure receiving cylindrical neck is modified to incorporate a shorter outer cylindrical collar surrounding the neck. A closure assembly made up of a nestable pouring spout and an internally threaded screw cap is affixed to the opening neck. The pouring spout is surrounded by an integrally molded sealing channel having an axially extending inner wall and a peripheral interlocking outer wall. To secure the closure to the pail opening the spout inner wall is guided within the opening neck and the spout outer wall is axially forced between the outer surface of the upstanding neck and the inner diameter of the surrounding collar. With the spout sealing channel outer wall interlockingly squeezed between the opening neck and surrounding collar, a liquid tight tamper resistant connection is formed.