Natural gas pilot assembly, works on the Following water heater 9003542 #s: 6-30-yours, 6-30-yours-d, 6-30-yort-d, 6-40-yort-d, 6-30-yort4, 6-50-yort4, temperature setting 190°ree., please make sure to use the corresponding pilot assembly to the water heater, refer to the tag on the original pilot assembly to match with the new pilot assembly.