Protect your GMC Sierra MultiPro tailgate or Chevrolet Silverado Multi-Flex tailgate from costly damage from trailer hitch accessories. This hitch cap sensor detects if there is a hitch accessory installed in the receiver tube and prevents the inner tailgate from folding down and hitting the ball mount or other accessory. This Chevrolet / GMC tailgate sensor installs easily with everything included in the kit. It requires no extra electronic components and installation does not require cutting or splicing. This Chevy / GMC tailgate saver fits virtually any 2-1/2-inch x 2-1/2-inch trailer hitch receiver. It has a sleek, durable design for use on work trucks, and it will not interfere with your hitch accessories or trailer.