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[SECTION 01 — UNDERSTAND YOUR SYSTEM]

Faucets & Cartridges

How modern faucets work, why they drip, and what a cartridge actually does.

Interactive Photo Diagram

Faucet & Components

Faucet & Components

An exploded view of a single-handle (Moen-style) kitchen faucet — every part from the handle button down to the supply line connections. Tap a component for a short explanation, common problems, and safe checks.

Reference checked: component relationships and terminology were reviewed against manufacturer documentation from Moen and Delta. This is original Classic Plumber educational artwork, not a manufacturer drawing.

Tap a labeled component to learn what it does.

Overview

A faucet mixes hot and cold water and controls flow. Inside, a cartridge or valve opens and closes to regulate water. When that internal seal wears out, the faucet drips — even when the handle is off. The good news: most faucets can be repaired by replacing the cartridge, not the whole faucet.

How It Works

When you lift or turn the handle, the cartridge rotates to open passages for hot and cold water. The mixture flows through the spout and out through the aerator. When you close the handle, the cartridge seals shut. If the internal seals are worn, water seeps through even when the handle is closed — that's the drip.

Key Components

Cartridge (single-handle)

A single internal valve that mixes hot and cold and controls flow. The most common drip cause.

Stem & Seat Washer (two-handle)

Older two-handle faucets use a stem with a rubber washer that presses against a brass seat.

Aerator

The small screen at the spout tip. Mixes air with water for a smooth stream and catches sediment.

O-Rings

Rubber seals around the spout and handle. When they wear, leaks appear at the base.

Shutoff Valves

Under the sink — one for hot, one for cold. Close these before any faucet repair.

Common Issues

Dripping from the spout

Worn cartridge or seat washer.

Read the guide

Leaking at the handle

Worn O-rings around the handle or spout.

Low pressure at one faucet

Clogged aerator — unscrew and clean it.

Read the guide

Spraying unevenly

Mineral buildup in the aerator or showerhead.

Maintenance Tips

  • Clean the aerator every 6–12 months — soak in vinegar to dissolve mineral buildup.
  • Note your faucet brand (Moen, Delta, Kohler) — many offer free replacement cartridges under warranty.
  • Don't overtighten handles — it wears the cartridge faster.
  • If the faucet is under warranty, check with the manufacturer before paying for parts.

WARRANTY INFORMATION

Many faucet manufacturers (Moen, Delta, Kohler) offer lifetime warranties on cartridges and internal parts for the original owner. If your faucet is dripping, the cartridge may be free — you only pay for labor if you hire a plumber. Check the manufacturer's warranty page with your model number.

Still not sure what's wrong?

Ask our AI Plumber about this topic — your conversation will start with context from this guide so you don't have to start over.

Helpful answers wherever you live. Local service when you need it.

In Knoxville or the surrounding area?

The Classic Plumber provides onsite plumbing service in Knoxville, Karns, Powell, Farragut, and nearby communities. Tell us what you noticed and we will confirm coverage and availability before scheduling.

Outside our service area?

Our guides and AI Plumber are available to help you understand the problem wherever you live. For an onsite diagnosis or repair, contact a qualified plumber in your area. Local requirements and plumbing systems can differ.

Ask the AI Plumber

What to tell your plumber

Note when the problem started, which fixtures are affected, whether it is constant or intermittent, and any recent plumbing work. Photos of accessible equipment and model labels can help. Describe any checks you have already tried without opening equipment or entering an unsafe area.