What Is a Supply Line?
A supply line is a flexible or rigid tube that carries clean water from a shutoff valve to a plumbing fixture. In toilet installation, it connects the toilet tank to the valve in the wall or floor. The line must fit both connections and allow water to reach the fixture without leaking.
Quick Facts About Supply Line
Category
Water connection component
Used for
Supplying fixture water
Common confusion
Mistaken for a drain line
Also called
Water Supply Line, Toilet supply line
Often discussed with
Toilet Installation
Key Takeaways About Supply Line
- It connects a fixture to a water shutoff valve.
- A flexible line makes toilet installation easier in tight spaces.
- It is not the drain pipe that carries wastewater away.
How Supply Line Works
A supply line carries pressurized water between a shutoff valve and a fixture. A toilet supply line runs from the valve near the floor or wall to the threaded connection under the toilet tank. The line fills the tank after flushing.
Related glossary terms: Main Shutoff Valve, Compression Fitting, Toilet Flange.
Flexible braided lines bend around nearby parts and connect with threaded fittings. Rigid lines use shaped tubing and may need careful alignment. The shutoff valve controls water flow during installation or service. A washer inside the connection helps form a watertight seal, while the shutoff valve stops water before the line.
Toilet Installation Use
During toilet installation, the line must reach the tank without pulling or kinking. The connection should stay accessible after the toilet is set. A new line may be needed when the old one shows corrosion, damage, or poor fit.
Expert Note
When we install a toilet, we check the supply line's length, fittings, and condition before connecting the tank. We open the shutoff valve slowly and inspect both ends for seepage. Our team also checks that the line does not bend sharply behind the fixture.
Supply Line in Practice: A Real-World Example
During a toilet installation, the supply line connects the wall shutoff valve to the new toilet tank. The installer makes sure the line reaches comfortably and checks the connections after turning the water on.
Related Services
Related Terms
Main Shutoff Valve
A main shutoff valve is the control that stops water from entering a building through the…
Compression Fitting
A compression fitting is a plumbing connector that joins pipe or tubing without soldering or threaded…
Toilet Flange
A toilet flange is a fitting that connects a toilet to the drainpipe and anchors it…
Wax Ring
A Wax Ring is a soft sealing gasket that fits between a toilet and the drain…
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