Replacement 1-piece metal bolt-in valve stems for Class C GM Dually's. Traditionally, adding air to dually tires was difficult which required the use of specially designed air chucks and specially designed air gauges just to get to the valve stem. Not anymore! Duallyvalves are designed to make tire pressure checks and inflation easy on motorhomes. The length of the inner dual valve has been extended to reach the outer dual and the outer stem is curved making it easy to add air.