You can use the Materials Paintbrush to apply different colors or finishes to different parts of a plumbing fixture.
To apply a color or finish to a plumbing fixture:
Display your model in 3D, and make sure the fixture is visible in the view.
Select Edit
> Materials Paintbrush, or click the Materials Paintbrush button
on any tabbed toolbar.
In the catalog panel, select the color or finish you want to apply. You can find an assortment of colors in the Paint category.
Click on the component you want to apply the material to. Materials are applied separately to the individual parts of the plumbing fixture. For example, you can select a different color just for a tap or handle.
When you are finished applying materials, right-click and select Finish.