CURT Receiver Tube Adapters are made to adapt a receiver opening to a different size. Adjust your receiver from 1 ¼” to 2”, 2” to 1 ¼”, or 2 ½” to 2”. Receiver tube adapters work great to tow a cargo carrier, bike rack, or ATV hitch hauler. Gross tow weights (GTW) are available from 3,500 to 8,000 lbs. This high-quality CURT product is finished with a durable powder coat for added rust resistance.