The following options will only work if more leakage distance is needed. The acronym is HEM. HEM stands for High Creep, Extra High Creep, and Mega High Creep. This allows the arrester to keep the same UC (MCOV), but use a larger housing. If a 213709-7214 with higher leakage (creep) is needed, the part number would become 213709H-7214. If additional creep is needed 213709H-7214 is still not high enough, the part number would become 213709E-7214.