The square shape of a cleanout ________ the possibility of stripping the plug during removal.

The square shape of a cleanout minimizes the possibility of stripping the plug during removal because its design allows for a flat surface that provides better grip compared to round shapes. When a tool such as a wrench engages with the corners of a square fitting, it spreads the force more evenly across the surfaces, reducing the likelihood of slipping or rounding off the edges of the plug. This design feature is particularly advantageous when dealing with older or rusted fittings, as it allows for more torque to be applied without damaging the plug itself.

In contrast, other shapes, like round cleanouts, might not provide the same level of grip, leading to a higher risk of stripping. Additionally, shapes that complicate the interaction or do not fit standard tools well can also hinder removal efforts, making the square design a practical choice in plumbing applications.