How to Prevent Common Mixer Tap Installation Problems

Quick answer (read this first)

• Always turn off the main water supply before starting.
• Use plumber’s tape on all threaded connections for a secure seal.
• Ensure all connections are hand-tight, then use a wrench for a final quarter turn without overtightening.
• Check for leaks immediately after installation by slowly turning the water back on.

Safety first

• Turn off the main water supply to prevent unexpected floods.
• Wear safety glasses to protect your eyes from debris or splashes.
• Use gloves to prevent cuts and scrapes from tools or sharp edges.
• Be cautious when working in confined spaces under sinks to avoid injury.

Tools you may need

• Adjustable wrench or basin wrench
• Plumber’s tape (PTFE tape)
• Screwdriver set (Phillips and flathead)
• Bucket or old towels for catching water drips
• Torch light or headlamp (for visibility under the sink)

Step-by-step

Step 1

Locate and turn off your home’s main water supply. Open existing taps to drain any residual water from the lines.

Step 2

Carefully disconnect and remove the old tap. Use a basin wrench to loosen nuts underneath the sink and detach the supply lines.

Step 3

Thoroughly clean the tap mounting area on the sink. Remove old sealant, grime, or debris to ensure a clean surface for the new tap’s seal.

Step 4

Position the new mixer tap onto the sink hole. Feed the flexible supply lines and the main mounting stud through the opening.

Step 5

From underneath the sink, secure the tap. Place the rubber washer, metal washer, and tightening nut onto the stud, ensuring the tap is centered and firm.

Step 6

Apply plumber’s tape clockwise to the threads of both hot and cold water supply lines. Connect these lines firmly to the tap’s flexible hoses.

Step 7

Use an adjustable wrench to tighten all connections. Ensure they are snug but avoid excessive force which can damage threads or pipes.

Step 8

Slowly turn the main water supply back on. Carefully inspect all connections and the tap’s base for any immediate signs of leaks or drips.

Common mistakes

• Forgetting to turn off the main water supply, leading to unexpected water flow and potential flooding.
• Not using plumber’s tape (PTFE tape) on threaded connections, which almost always results in persistent leaks.
• Overtightening nuts and stripping threads or cracking plastic components, leading to irreparable damage.
• Incorrectly connecting hot and cold water lines, causing reversed water flow or unexpected temperatures.
• Ignoring minor drips or slow leaks, which can escalate into significant water damage over time.
• Using old or damaged flexible supply lines, which are prone to bursting or leaking under pressure.

When to call a professional

• If you encounter persistent leaks that cannot be resolved after careful re-tightening of connections.
• If the existing plumbing under your sink is corroded, damaged, or requires modifications beyond a simple tap replacement.
• If you experience a significant drop in water pressure after installation, indicating a potential blockage or incorrect fitting.
• If the installation involves complex pipe rerouting, soldering, or requires specialized tools you do not possess.
• If you feel uncomfortable, unsure, or lack the necessary confidence to perform the installation yourself, to prevent costly errors.