You can morph a conduit into a pressure pipe and vice versa. Any applicable data associated with the link will be carried over to the new link after the morph.

When the node to be morphed is connected to a link you may receive a prompt (similar to the one pictured below) if the morph is going to result in invalid connectivity.

To morph a conduit into a pressure pipe, right-click it and select the Morph Conduit to Pressure Pipe command.