IronRidge heavy duty cast aluminum Top Caps secure quickly and easily to schedule 40 pipe with 2 set screws. Available in sizes that fit either 2” or 3” schedule 40 pipe, this Top Cap supports cross (schedule 40) piping with U-bolt hardware. The top caps are manufactured using cast aluminum ALMAG 535 and come with a mill finish. Schedule 40 pipe not included. Order 2 per block purchased.