You draw flexible pipes using the Flex Pipe tool on the Systems tab
Plumbing & Piping panel or using the Draw Flex Pipe option on the context menu when right-clicking a connector for pipe ends, pipe fittings, mechanical equipment, pipe accessories, and plumbing fixtures. The following steps provide an example of adding flexible pipes to connect components in piping plans. This tool is only available in plan and 3D views. You can modify the position of vertices to change the shape of flex pipe in a section or elevation view.