BRASS MATERIAL: Made from high quality brass, the flow control valve is very strong and durable. THICK BODY: Adopting thickened body, the brass pipe fitting is durable and has long service life. UK SYSTEM: Adopting the most widely used UK system refueling hose connection, 1/4" to 5/16". EASY TO INSTALL: Install the end of the charge hose and minimize refrigerant loss during maintenance. APPLICATION: The water control valve hose connector is designed for R410A refrigerant charging hose. Thanks to this tool, no more refrigerant is burned on your hands. Due to factors such as manual measurement and display differences, there may be slight differences between individual products and individual products. images, please excuse me.