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 4140-01-218-7205
NSN 6685-00-981-7812
NSN 6220-00-406-5045
NSN 5945-00-233-7426
NSN 6105-01-241-9225
NSN 6130-00-171-7400
NSN 6645-01-500-0827
NSN 6145-00-316-2608
NSN 5910-01-367-6155
NSN 5945-01-418-7346
NSN 5945-00-290-1779
NSN 5915-01-504-2312