Norco Professional Lifting Equipment - The 910048 Heavy Duty Threaded Adapter screws into the tops of the cylinders and provide a threaded connection for other attachments. Caution: When cylinders are used with maintenance set attachments or components, the maximum system pressure must be limited to half the rated pressure (5,000 PSI). The Threaded Adapter has a 5 Ton Capacity (10 and 15 Ton on Cylinders), and has a connection of 1.25x11.5 Male.