Why can a floor drain often be set to the proper grade without an extension?

A floor drain can often be set to the proper grade without an extension because many floor drains are designed with a built-in mechanism that accommodates the necessary slope for drainage. This design typically includes a tapered bottom or adjustable fitting that allows for the correct elevation, ensuring that water flows efficiently toward the drain while maintaining a consistent gradient.

By having this built-in feature, the installation process becomes more straightforward, as there is no need for additional components that would otherwise complicate the setup. This design enhances both the functionality and efficiency of the drainage system, as it minimizes potential issues related to misalignment or improper grading often found in installations requiring extensions.

The availability of built-in features is a significant advantage in plumbing applications, contributing to a more streamlined installation and reliable performance over time.