Ball Cock
Definition and meaning of Ball Cock in real estate.
A ball cock is a plumbing valve assembly inside a toilet tank that automatically controls the flow of water filling the tank after a flush. It uses a floating ball connected to a lever to shut off the water once the tank reaches a set level.
In more detail
As the toilet is flushed, the water level in the tank drops, causing the floating ball to fall and open the inlet valve. Fresh water flows into the tank until the rising water level lifts the ball back up, closing the valve. While older systems used a large brass or plastic ball on a metal rod, modern toilets often use a compact float cup mechanism on a vertical shaft. A malfunctioning ball cock can cause the toilet to run continuously, wasting water and increasing utility bills.
Key facts
| Category | Property Types & Construction |
|---|---|
| Alternate spelling | Ballcock |
| Location | Inside the toilet tank |
| Function | Controls water intake and prevents overflows |
A homeowner hears water running constantly in their bathroom and adjusts the float arm on the ball cock to stop the tank from overfilling into the overflow tube.
Frequently asked questions
What are the signs of a failing ball cock?
The most common signs are a toilet that runs continuously, a slow-filling tank, or a high-pitched whistling noise during the fill cycle.
Can a homeowner replace a ball cock themselves?
Yes, replacing a ball cock or modern fill valve is a common, inexpensive home repair project that requires only basic hand tools and a replacement kit.