A ___________________ cannot be used to wet vent a water closet?

The correct response highlights important bathroom plumbing principles. A clothes washer cannot be used to wet vent a water closet because wet venting is a specific plumbing method that allows certain fixtures to share a common vent. However, to maintain compliance with plumbing codes and ensure proper drainage, certain restrictions apply.

The wet venting concept is primarily applicable to bathroom fixtures like showers, sinks, and tubs; these fixtures can connect to the same venting system while allowing air into the system to prevent siphoning. A clothes washer, being a laundry fixture, poses unique drainage characteristics and typically requires its venting to accommodate different waste flow dynamics.

In the context of plumbing codes, the inclusion of a clothes washer in wet venting scenarios can lead to potential cross-contamination of waste from different fixtures or inadequate venting capacity, causing operational and safety issues. This is why using a clothes washer as part of a wet vent system for a water closet is not permissible under the Omaha Plumbing Code.