Plug, oil pan drain for engine related parts for the Case-IH 1026, 1066, 1086, 1256, 1456, 1466, 1486, 1566, 1586, 21026, 3388, 3488, 3588, 3688, 3788, 4100, 4156, 4366, 4386, 4568, 4586, 4786, 5088, 5288, 5488, 560, 6388, 656, 6588, 660, 666, 6788, 686, 706, 766, 856, 886, 966, 986, HYDRO 100, HYDRO 186, HYDRO 70, HYDRO 86 model tractor(s).