Material: Chrome Plated Brass
Size: 15mm x 1/2"
Colour: Chrome
Angle:  90 degree
Manufacturer's Warranty: 1 Year
WRAS approved

15mm x 1/2" chrome plated 90 degree Anged Service Valve - supplied with pre-loaded olive in compression nut.  
Screwdriver slot to shut off valve. 
Suitable for hot and cold water systems. 
 
A 
compression to swivel service valve is a plumbing component that connects to a pipe with a compression fitting at one end and a swivel union at the other, allowing a part of a water system to be isolated for maintenance without draining the whole system. The compression side creates a seal with the pipe, while the swivel union allows for easy connection to an appliance like a tap or toilet. 
Function and purpose
Isolates water supply: Its primary function is to allow a specific section of plumbing, such as a sink or toilet, to be turned off using a screwdriver-operated slot.
Prevents draining the system: This prevents the need to shut off the main water supply and drain the entire property to perform work on a fixture or pipe.
Easy installation: The compression fitting is a tool-free method for connecting to a pipe, while the swivel union allows for flexible connection to the outlet. 
Components
Compression end: This is where the valve connects to the pipe. It uses a nut and sleeve to create a watertight seal by compressing the components onto the pipe.
Swivel union nut: This part has a threaded connection that can pivot and rotate, making it easy to connect to a flexible hose or the inlet of a fixture like a tap or toilet.
Screwdriver slot: A slot on the valve's head allows it to be operated with a screwdriver to open or close the flow of water. 
Use in different situations
Permanent connections: Compression fittings are considered reliable for permanent plumbing work, especially in tight spaces or areas where a soldering torch is not practical or safe.
Repairs and maintenance: They are ideal for situations where you need to quickly and safely turn off the water to a specific fixture, such as for replacing a tap or showerhead.