Abstract: A filter inspection apparatus for inspecting filters comprises a support frame for supporting a substantially tubular filter having inner and outer surfaces for rotation about its axis, a source of EMR for directing radiation along one of the inner and outer surfaces of a filter, an EMR sensing unit mounted adjacent to the other of the surfaces for sensing EMR passing through the filter and generating a signal, and an indicator responsive to the signal for indicating passage of EMR through the filter.

Abstract: A filter cleaning apparatus for cleaning cylindrical filters comprises a support frame, a mounting clamp on the support frame for supporting a filter in a vertical orientation, inner and outer air nozzles mounted for vertical movement along the inner and outer surfaces of a filter for directing an air jet against the respective surface for dislodging debris therefrom, and inner and outer vacuum nozzles mounted adjacent to and moveable with the air nozzles for drawing in debris dislodged by the air jets.

Abstract: An angle stop box for the installation of cut off lines to plumbing fixtures, comprises a generally box-like housing having an open front and an outwardly extending flange for attachment to a wall stud, an aperture through one wall of the housing, a stub line extending through the aperture and secured in the wall, an angle stop valve mounted on one end of the stub line within the housing, and an extension wall extending beyond the flange for extending through a wall panel and a peripheral cover for extending over and covering the juncture of the housing and a wall cover.