Explore the plumbing
What is inside a toilet?
Tap a number or part name to see what it does and what to look for.
A common gravity-flush toilet, shown in cutaway. Flush mechanisms and shapes vary.
1. Fill valve
Refills the tank after a flush. Its float responds to the rising water level.
A running toilet can have more than one cause; a fill valve is only one part to check.
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2. Flapper
Seals the flush-valve opening at the bottom of many toilet tanks. It lifts to let water into the bowl.
A worn or mismatched flapper can let water leak from the tank into the bowl. Some toilets use a canister instead.
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3. Overflow tube
Provides a route from the tank into the bowl if the tank water rises too high. The refill tube supplies bowl refill water here.
It is different from the flapper. Use the toilet and valve instructions to identify the correct parts.
Get help with a running toilet →Parts & tools
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Includes an adjustable overflow assembly; match tank and bowl fit.
View on Amazon ↗4. Supply stop
The local valve controls incoming water to the toilet. The flexible connector runs from it to the fill valve.
A seized valve or leaking connector needs attention; do not force a stuck valve.
Explore leak detection →Parts & tools
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3/8-inch compression × 7/8-inch ballcock; measure reach.
View on Amazon ↗
Match inlet and outlet sizes to the existing supply.
View on Amazon ↗5. Trapway
This curved passage carries waste from the bowl toward the drain. Water remaining in the bowl helps block sewer gases.
A toilet auger is designed for the fixture. Repeated clogs or multiple backed-up fixtures need further diagnosis.
Compare toilet augers →Related tool
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Related clearing tool. The trapway itself is built into the toilet.
View on Amazon ↗Illustrations explain common parts and conditions. They do not diagnose your home or replace the instructions for your specific equipment.
Professional Bathroom Plumbing Services
Bathroom plumbing problems can range from a dripping faucet or running toilet to leaking fixtures, clogged drains, damaged supply lines, or problems with tubs and showers. Sergeant Plumber Corp. provides professional bathroom plumbing repair, replacement, and installation services in The Colony and surrounding North Texas communities.
Your technician will evaluate the affected plumbing or fixture and explain the findings. Available repair or replacement options and upfront pricing will be discussed before authorized work begins.
Toilet Repair & Replacement
We repair and replace toilets that are running, leaking, clogged, loose, difficult to flush, or no longer operating properly. We can also install customer-supplied or replacement toilets and evaluate accessible supply lines, shutoff valves, seals, and connections.
Before choosing parts, see our running-toilet troubleshooting and flapper sizing guides.
Faucets & Sinks
We service bathroom faucets, sinks, drains, shutoff valves, supply lines, and related plumbing connections. Whether the problem is a dripping faucet, leaking drain, damaged fixture, or a fixture that needs replacement, we will evaluate the issue and discuss the available options.
For a single sink that drains slowly—but is not leaking or backing up elsewhere—use our bathroom-sink clog tool guide to compare a hair-removal tool, sink plunger, and hand snake. If the clog returns, drain chemicals were used, piping leaks, or more than one fixture is affected, stop and request service.
Showers, Tubs & Drains
We repair and service shower and tub plumbing, including faucets, valves, cartridges, tub spouts, shower heads, drains, and accessible piping. We can also diagnose slow drains, leaks, temperature-control problems, and other common shower or tub plumbing issues.
Signs Your Bathroom Plumbing May Need Service
Bathroom plumbing problems may develop gradually or appear suddenly. Professional service may be recommended if you notice:
What to Expect During Bathroom Plumbing Service
1. Initial Assessment and Diagnosis
Your technician will discuss the symptoms you have noticed and inspect the accessible bathroom plumbing, fixtures, drains, valves, and connections related to the problem. The applicable service or diagnostic fee will be explained before the appointment is scheduled.
2. Findings and Upfront Options
After the evaluation, the findings and available repair, replacement, or installation options will be explained. Any visible plumbing or fixture conditions that may affect the recommended work will also be reviewed. Pricing will be provided before authorized work begins.
3. Approved Work and Verification
We will complete the approved work using the appropriate parts, materials, and installation methods. The repaired or replaced fixture and affected plumbing connections will be tested for proper operation before the service is considered complete.
Important Information About Bathroom Plumbing
Bathroom plumbing repair and replacement requirements vary depending on the fixture, piping, accessibility, existing installation, and condition of the surrounding materials. In some situations, additional work may be needed if concealed damage, deteriorated piping, damaged shutoff valves, or other plumbing concerns are discovered during service.
Customer-supplied fixtures will be evaluated for compatibility with the existing plumbing before installation. Any additional repairs, modifications, or installation requirements outside the approved scope will be discussed and priced before that work begins.
Need Bathroom Plumbing Service?
Leaking fixtures, clogged drains, running toilets, damaged faucets, or other bathroom plumbing problems may require professional service. Call, text, or request service to discuss the issue and schedule an evaluation.