Which type of brush is recommended for cleaning handhole seating surfaces?

The recommended choice for cleaning handhole seating surfaces is the cup-brush. Cup brushes are designed to conform to the curved shapes of various surfaces, which makes them particularly effective for reaching into the rounded areas of handhole seating surfaces. Their shape allows them to provide a thorough cleaning without compromising the integrity of the surface, ensuring that any contaminants or debris are effectively removed.

While other types of brushes, such as flat brushes, round brushes, and wire brushes, serve specific purposes and can be useful in various cleaning applications, they may not be as effective on curved surfaces. Flat brushes might not reach into the recesses of the handhole adequately, and round brushes typically lack the same level of surface compliance. Wire brushes, although useful for heavy-duty cleaning, can be too abrasive and risk damaging the seating surface if used improperly, which is crucial to maintain for proper sealing and function. Thus, the cup-brush is the most appropriate tool in this context.