Abstract: Apparatus is disclosed for retaining the rear window of a truck in place within its window frame while the urethane seal therebetween is curing. The overall length of the apparatus is adjustable and suction cups are attachable in a spaced-apart relationship to the central portion thereof to grippingly engage the window and hold same in place during the curing process. An adjustable tie-down clamp is received through each of the opposite ends of the apparatus and engages either a window frame in the truck cab or the truck door frame.