How to How to Replace a Garbage Disposal
Garbage disposals typically last 10-15 years. Learn to remove an old disposal and install a new one safely, saving hundreds in labor costs.
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0 of 7 steps completedStep-by-Step Instructions
1 Step 1: Choose the Right Disposal
Mike Johnson: "Pro tip: Make sure to double-check this before moving to the next step..."
Step 1: Choose the Right Disposal
Horsepower: 1/3 HP for light use, 1/2 HP for regular use, 3/4-1 HP for heavy use. Check if you need continuous feed (most common) or batch feed (safer with kids). Verify it fits your sink mount type.
InSinkErator Evolution Excel 1 HP
Top-rated, quietest disposal, grinds anything including bones
2 Step 2: Turn Off Power and Remove Old Unit
Mike Johnson: "Pro tip: Make sure to double-check this before moving to the next step..."
Step 2: Turn Off Power and Remove Old Unit
TURN OFF BREAKER for disposal circuit. Test with voltage tester. Place bucket under unit. Disconnect dishwasher drain hose. Disconnect drainpipe. Use disposal wrench or screwdriver to rotate mounting ring counterclockwise, release disposal.
3 Step 3: Remove Sink Mounting Assembly
Mike Johnson: "Pro tip: Make sure to double-check this before moving to the next step..."
Step 3: Remove Sink Mounting Assembly
Only if replacing with different brand. From under sink, loosen 3 mounting bolts. Push up on sink flange from above. Remove putty from sink opening. Clean thoroughly.
4 Step 4: Install New Mounting Assembly
Step 4: Install New Mounting Assembly
Roll plumber's putty into rope, apply around sink flange. Press flange into sink opening. From below, slide on fiber gasket, backup ring, mounting ring. Tighten 3 bolts evenly until snug. Clean excess putty from top.
5 Step 5: Wire the Disposal
Step 5: Wire the Disposal
Remove electrical plate on disposal. Connect wires: white to white, black to black, green (ground) to green screw. Replace plate. If hardwired (no plug), connect Romex cable the same way.
6 Step 6: Mount Disposal and Connect Plumbing
Step 6: Mount Disposal and Connect Plumbing
Lift disposal, align with mounting tabs, rotate mounting ring clockwise until locked. Connect discharge tube to drain pipe with slip nut. If dishwasher: knock out drain plug with screwdriver, connect hose.
7 Step 7: Test for Leaks
Step 7: Test for Leaks
Turn on water, fill sink halfway. Check all connections for leaks while water drains. Turn on power at breaker. Turn on disposal - should run smoothly. Drop ice cubes and lemon peels to clean and test.