Interactive Photo Diagram
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
Leaking at the handle
Worn O-rings around the handle or spout.
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.