The "Ball O Stop 15mm CC Lever" typically refers to a ball valve with a compression connection (CC) sized at 15mm, which is commonly used in plumbing systems. Here's a breakdown of what it does:

Function:

• Shuts off or allows flow of water (or sometimes gas) through a pipe.

• The lever provides a simple on/off control — when the lever is aligned with the pipe, the valve is open; when it’s turned 90°, the valve is closed.

Components:

• Ball valve: Uses a rotating ball with a hole through it to control flow.

• 15mm: Refers to the pipe diameter it's designed for (common in domestic plumbing, especially in the UK).

• CC (Compression Connection): It attaches to copper or plastic pipe using a compression fitting — no soldering required.

• Lever: The handle used to manually operate the valve.

Common Uses:

• Isolating water supply to sinks, toilets, washing machines, etc.

• Emergency shutoff points.

• Maintenance access.