Air Filter Plus Pre Filter For Kohler Air Filter 231847S, 231847-S, Pre-Filter 234869S. Same As John Deere AM30800, Onan 140-1188 Quality Aftrmarket Air Filter and Pre-Filter. Air Filter Replaces Kohler 231847S Pre-Filter Replaces Kohler 234869S Same As Onan 140-1188, John Deere AM30800 ID: 3", OD: 4-3/8", Height: 2-3/8"