Brand new Exhaust manifold to muffler gasket. Fits generator models MEP-802 MEP-803 fits 5 KW or 10KW unit. These will work in the 60hz or 400hz models as the prime movers are the same. This is an aftermarket will fit part that requires the mounting holes to be elongated slightly. This is the gasket we use when doing rebuilds in out shop. Fits LPW 366-01287 NSN# 5330-01-390-5185 They are not included in the decoke kits so you have to buy them separately. WRD12