Installed InSinkErator Evolution Excel 1HP disposal to replace non-functioning unit. Removed old unit (corroded beyond repair), cleaned flange area thoroughly. Modified drain plumbing slightly to improve flow. Connected to existing electrical with proper strain relief. Tested for leaks and proper operation - running smoothly and MUCH quieter than old unit! Added sound insulation beneath sink to further reduce noise. Demonstrated proper operation and what NOT to put down disposal. 7-year warranty information left with customer. 30-minute job done right!