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 5960-01-026-9005
NSN 6320-00-098-2858
NSN 5960-00-552-1940
NSN 5835-01-085-5487
NSN 5999-01-361-4413
NSN 5996-01-106-1074
NSN 5925-00-548-7068
NSN 6650-00-302-1369
NSN 5855-01-057-7818
NSN 6150-01-128-4487
NSN 6320-01-631-7828
NSN 7035-01-256-1440