a plastic container for pourable liquids such as detergents has a drain back feature and has an internal thread for receiving an externally threaded cap which also serves as a measuring cup for the liquid . the container is formed in two pieces , a container body and a separately formed pour spout component which is assembled to the container finish preferably by ultrasonic welding . in preferred embodiments a lip of the pour spout component is pressed and welded down onto an annular top surface of the container finish , or down into an annular recess on the container finish . the ultrasonic welding operation is accompanied by motion and pressure , simultaneously deforming and welding the top edge of the pour spout component wall down onto the container finish , so that the connection forms a liquid tight seal .