Which of the following materials may not be used to secure a closet flange to the floor?

The selection of materials used to secure a closet flange to the floor is crucial for ensuring a stable and leak-free installation. Brass plated bolts or screws are not recommended for this application because they can corrode over time, especially in wet environments like bathrooms. This corrosion can lead to weakening of the flange and eventual failure of the toilet installation, which could cause leaks.

In contrast, the other materials mentioned—brass and stainless steel—are known for their durability and resistance to corrosion, making them suitable for securing closet flanges. Plastic anchors can also be used in certain installations, particularly in conjunction with other types of fasteners to provide additional support when fixing into drywall or other materials that require anchoring.

By utilizing materials that resist corrosion, like solid brass or stainless steel, you promote the longevity of the installation and ensure that the connections remain secure over time. This understanding is critical for maintaining proper plumbing standards as outlined in the Omaha Plumbing Code.