caption: The image shows a black and white photo of a group of three different types of valves, which appear to be an autoclave. The valves are arranged in a triangular formation, with the largest valve in the center and two smaller valves on either side. The largest valve is a cylindrical shape with a handle on the top, while the two smaller ones are smaller and have a more rounded shape. All three valves have a metallic finish and are connected to each other by a series of pipes and valves.