Chief CMA270 Threaded Pipe Coupler attaches two separate 1 1/2 inch NPT threaded columns together for added length. 2 1/16 inch height added to installation. Two set screws included for security and stability. It is a threaded pipe coupler that connects two separate 1.5 inch NPT threaded columns together for added length. Two set screws are included for security and stability. Has a weight capacity of 500 pounds.