What It Is
A drain snake is a flexible metal cable that a plumber feeds into a drain pipe to break apart or retrieve a clog. Also called a plumber's snake or hand snake, it is the most common mechanical tool for clearing blocked sinks, showers, and tub drains. It works by physically disrupting the obstruction rather than dissolving it with chemicals.
What It Does
The snake travels through the pipe until it reaches the blockage. Depending on the type of clog, the plumber will either rotate the cable to break the obstruction apart - so it flushes down - or hook it to pull the material back out. Hair clogs, soap buildup, and foreign objects respond well to snaking.
A drain snake addresses a localized clog in a single fixture or short drain run. It does not clean pipe walls the way hydro jetting does, and it is not designed for main sewer line work the way a power auger is. It is best suited to bathroom drains, laundry drains, and kitchen sinks where the clog is relatively close to the opening.
Where It Is Located
The snake enters through the drain opening - a sink drain, shower drain, or tub overflow plate. Some plumbers remove the p-trap under a sink first to give the cable a cleaner path into the drain line. For main sewer lines, a larger motorized cable machine is used instead.
How It Works
A basic hand snake is a coiled steel cable housed in a drum canister. The plumber feeds the cable into the drain and cranks a handle to rotate it. The rotation helps the cable navigate bends in the pipe and drives the tip into the clog. When the tip meets resistance, the plumber can feel it through the cable and apply more turning force to break the clog or hook it for retrieval.
Professional snakes are motor-driven for more torque and longer cable reach. Cable lengths range from about 15 feet for a hand snake to 50-100 feet or more for power machines used on main drain lines.
Common Problems or Signs of Failure
A drain snake is appropriate when:
- A single sink, shower, or tub drains slowly or won't drain at all
- The clog is likely hair, soap, or a foreign object near the drain opening
- Chemical drain cleaners haven't worked
- The clog is recurring in the same fixture
A snake is not the right tool when multiple fixtures back up simultaneously - that indicates a main line problem that requires a larger machine or inspection first.
Can a Homeowner Check It?
- You can remove and clean the drain stopper or strainer - hair often accumulates right at the opening and can be pulled out by hand without any tools.
- Basic hand-crank drain snakes (also called drum augers) are available at hardware stores and can be effective on simple bathroom clogs close to the drain.
- Be cautious with cheap plastic "drain weasel" type tools in PVC pipes - they work fine, but a metal hand snake requires some care to avoid scratching or getting stuck in the pipe.
- If the drain is still slow after a few attempts, or if more than one fixture is slow, call a plumber - it is likely a deeper or larger-scale blockage.
When to Call a Plumber
Call if a single drain won't clear after one or two attempts with a hand snake, if you can't tell where the clog is, or if the clog keeps coming back every few weeks. A plumber can reach further into the drain line and has better tools for retrieving foreign objects or breaking up compacted debris.
Also call if you've used a chemical drain cleaner and the drain is still blocked - the chemical is now sitting in the pipe and creates a safety concern for the plumber using tools in the drain.
Related Plumbing Problems
- Why Is My Sink Draining Slowly?
- Why Is Water Backing Up in My Drains?
- Why Is My Shower Draining Slowly?
Related Plumbing Terms
Related Gray's Services
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