A Compression 28mm Blue Handle T-Bar Butterfly Valve is a valve used in plumbing systems to control the flow of fluids. It features a 28mm compression fitting, allowing it to be easily connected to pipes without the need for welding or soldering. The valve is operated by a blue T-bar handle, which provides a simple way to open or close the valve by rotating the handle. The butterfly mechanism inside the valve uses a rotating disc to regulate the flow. This type of valve is commonly used in larger plumbing applications, such as water, heating, or industrial systems, where a 28mm pipe size is required for efficient and reliable flow control.