How to Replace a Kitchen Sink Faucet
Upgrade your kitchen sink by removing an old faucet, preparing the mounting deck, and installing a new single-handle or pull-down faucet with leak-free plumbing connections.
- Read the tools, materials, safety notes, and steps below for free.
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🧰 Required Tools & Equipment
- ✓ Basin wrench
- ✓ Adjustable wrench
- ✓ Small bucket or catch pan
- ✓ Channel-lock pliers
- ✓ Headlamp or flashlight
- ✓ Plastic putty knife
📦 Materials & Supplies
- ✓ Replacement kitchen faucet kit
- ✓ Plumber's tape (Teflon tape)
- ✓ Clean shop rags
- ✓ Silicone caulk or plumber's putty (if required by manufacturer)
⚠️ Safety Checkpoints & Warnings
- • Ensure both hot and cold shutoff valves completely stop water flow before loosening plumbing fittings.
- • Wear eye protection while working inside the sink cabinet to guard against falling rust, debris, and pressurized drips.
📋 Step-by-Step Guide (7 Steps)
Shut Off Water Supply and Relieve Pressure
Clear the area under the sink and locate the hot and cold water shutoff valves against the wall. Turn both oval handles clockwise until fully closed. Open the kitchen faucet handles completely to release residual line pressure and let standing water drain into the sink.
- • Water stops dripping completely from the opened faucet spout.
- • Both shutoff valve knobs are turned fully clockwise.
- • Failing to open the faucet after shutoff, leaving pressurized water in the lines.
- • Forgetting to verify that a main shutoff is accessible if older stop valves fail to seal completely.
Disconnect Water Lines and Sprayer Hose
Place a small bucket underneath the shutoff valves to catch residual water. Use an adjustable wrench to loosen the nuts connecting the flexible supply lines to the shutoff valves, turning counterclockwise. If your existing faucet has a pull-out sprayer or weight, unclip the weight and disconnect the quick-connect sprayer hose.
- • Supply lines hang freely into the bucket without dripping onto cabinet wood.
- • Sprayer hose weight is removed from the loop beneath the sink.
- • Allowing the valve body to twist while unthreading the nut; use a second wrench to brace older copper pipes.
- • Spilling water into the cabinet base without a catch bucket.
Remove Old Faucet Mounting Hardware and Lift Faucet
Reach up behind the sink basin using a basin wrench to grip and unscrew the large mounting nuts securing the faucet to the sink deck. Once the nuts and metal washers are threaded off, return to the top side of the sink. Carefully pull the entire faucet assembly and its attached flexible lines up and out of the sink holes.
- • Mounting nuts and washers are completely off the threaded mounting shanks.
- • Faucet body is lifted off the sink deck, leaving empty mounting holes.
- • Struggling with standard wrenches in tight sink clearance instead of using a long-reach basin wrench.
- • Pulling lines aggressively through holes and damaging sink rim edges.
Clean and Prepare the Sink Deck
Use a plastic putty knife to gently scrape away old plumber's putty, silicone sealant, and mineral deposits around the mounting holes. Wipe the entire surface with a damp shop rag, then dry it thoroughly. Inspect the mounting holes to ensure the surface is flat, clean, and free of jagged burrs.
- • Sink deck surface around all mounting holes is completely smooth, clean, and dry.
- • No old silicone residue or gummy putty remains on the sink rim.
- • Using a metal razor or screwdriver that scratches stainless steel, composite, or porcelain sink finishes.
- • Mounting the new baseplate over residual dirt or wet silicone, preventing a watertight seal.
Mount and Secure the New Faucet
Feed the new faucet's supply lines and mounting shank down through the sink deck hole, ensuring the rubber deck gasket (or deck plate) sits evenly against the sink surface. From underneath the sink, slide on the rubber washer, metal washer, and mounting nut. Tighten the mounting nut by hand, adjust the faucet alignment on top so it centers properly, then securely torque the nut with your basin wrench or supplied installation tool.
- • Faucet sits firmly perpendicular to the sink rim without wobbling when the handle is toggled.
- • Gasket is neatly compressed beneath the faucet baseplate with no gaps.
- • Over-tightening the mounting nut on a composite or porcelain sink, which can crack the deck.
- • Tightening the nut fully before checking that the faucet body is properly aligned and facing straight forward.
Connect Supply Lines and Hose Weight
Wrap 2 to 3 layers of plumber's tape clockwise around the male threads of each shutoff valve if using non-gasket fittings. Thread the faucet supply lines onto the hot (left) and cold (right) valves, tightening hand-tight plus one-half turn with an adjustable wrench. Snap the pull-down hose into the faucet outlet adapter and clamp the hose weight onto the designated mark on the pull-down line.
- • Hot and cold water line nuts are securely seated onto the shutoff valves.
- • Sprayer hose snaps firmly into place and retracts smoothly when pulled from above.
- • Cross-threading brass compression nuts onto the valves.
- • Attaching the hose weight in a spot where it snags on cabinet pipes or plumbing traps.
Flush the Lines and Test for Leaks
Unscrew the aerator nozzle from the tip of the faucet spout to prevent loose debris from clogging the screen. Slowly turn both wall shutoff valves counterclockwise to the full open position. Run hot and cold water through the faucet for one full minute, inspect all connections below with a dry rag for dampness, then reinstall the aerator.
- • Steady, clear water stream flows through the faucet spout.
- • Shop rag rubbed along every connection joint remains completely dry.
- • Leaving the aerator on during the initial flush, which traps construction sediment and chokes water pressure.
- • Turning shutoff valves on at maximum speed, causing sudden pressure spikes in the lines.
Don’t have everything?
- No Basin wrench? Channel-lock pliers or the plastic multi-tool included in the new faucet box
- No Plastic putty knife? Old plastic gift card or credit card