Kochek 6" LH Aluminum Plug for Dry Hydrant. Preferred by both domestic and international customers, Kochek's dry hydrants remain in demand. We continuously develop new methods to keep them affordable and accessible. Our dry hydrant adaptations fit all firefighting requirements as well as those for rural dry hydrant systems. Kochek's newest component for dry hydrant systems is a convenient in-line full-time swivel, now available on new hydrants or retrofitted to your existing equipment.