Features and Benefits:�Metal clamp-in type valves make filling with liquid ballast easy.�By removing core housing, a large opening is provided for air or liquid fill.�625" valve hole. Vertical Height: 1 7/8"�Perfect for tractor, grader and backhoe applications.�For use in grader, agriculture, tractor, implement, and other industrial applications.�The Alligator TR 618 Air/water rim valve for agricultural tractors For Air/Water filling. TR621 A air liquid valve stems can be used for tractors and road grader service vehicles. Air liquid valves come in different lengths and bends.