Muff .
Asm/A.M. Ac980, Series Not Applicable, Compatible with Grainger Part Number 33K677, 33K678, 33K679, 33K680, 33K681, 33K682, 33K684, 33K685, 33K687, 33K688, 33K689, 33K690, 33K692, 33K694, 33K695, 33K698, 33K704, 33K705, 33K708, Product Type Muffler Assembly.