Abstract: A magnetic tool retaining device for supporting wrench sockets or other ferrous tools on an upright mounting board or other surface is disclosed. The device includes a holder having a front mounting surface and rear attachment surface. A mounting post projecting outwardly from the front mounting surface includes resilient threadlike ridges for engaging and mounting a disc magnet on the front surface. The magnet has a magnetic mounting surface projecting outwardly from the holder. A lower lip projecting outwardly from the holder, beyond the magnetic face, prevents the wrench sockets from slipping off the face. Two projections project outwardly from the rear attachment surface and are dimensioned and spaced apart to engage corresponding holes in a mounting board. With the projections removed a screw received in a central opening of the mounting post can also be used to attach the device to a solid surface.

Abstract: A cleaning plug especially adapted for condenser tubes or the like and designed to be propelled through the tube by differential fluid pressure includes an elongated core body and a plurality of spaced scraper discs along the body. The discs have radial slits formed from adjacent the body to the outer periphery to define annular segments. The segments are flexible to readily deflect when the plug is placed in a confining tube and to give full peripheral scraping action. The discs are sufficiently larger in outside diameter than the inside of the tube and the slits are sufficiently narrow to cause the outer tips of the segments to touch each other during the cleaning operation. The segments are sufficiently flexible to snap past each other and overlap when the tube diameter is reduced. The inner portion of the slits form opening means for passage of propelling fluid and foreign matter and to dislodge foreign matter forward of the plug.