A sump that receives the waste from a single floor drain does not require ______________________________________.

A sump that receives waste from a single floor drain does not require an airtight lid because it is not dealing with the same level of potential odor control or gas buildup as a sump that serves multiple fixtures or is part of a larger drainage system. For a single floor drain, the volume of waste and the potential for volatile odors are limited, making an airtight seal less critical. Instead, proper ventilation may be sufficient to prevent any issues arising from gases, which is a consideration typically reserved for more complex drainage systems.

In some cases, local plumbing codes may specify requirements for airtight lids depending on the context of use and the specific function of the sump, but generally, single-drain sumps are often engineered to mitigate odor issues without the necessity of an airtight cover. This approach balances functionality, cost, and safety, making it practical for straightforward applications like a single floor drainage system.