You can create custom block-based components.
If parametric graphics for a component are not available, you can create your own piping component geometry using AutoCAD blocks.
When creating a block-based piping component, first specify the port locations in the AutoCAD Plant 3D toolset. Then, use the Catalog tab to create components using the blocks.
Tip: If the component is not required in the spec, it is easier to create a specialty component in the model.