A cylindrical or ball-shaped item fabricated of solid rubber, having a hole running through its center through which a threaded stem is inserted. A wing nut, two washers and the stem are supplied to apply pressure, thereby expanding the ball and plugging up inlet and outlet opening in radiators. It is used to locate leaks in the core or tank of a radiator and the like.
NSN 5960-01-413-3877
NSN 5905-01-620-3226
NSN 5998-00-147-3859
NSN 5905-01-256-3034
NSN 5996-00-969-9882
NSN 6320-00-116-3658
NSN 4140-00-980-0467
NSN 5915-01-131-0627
NSN 5960-00-199-6034
NSN 7035-00-470-4977
NSN 5999-01-392-6313
NSN 5930-01-260-3587