BrassCraft Faucet 1/4 Turn Ball Supply Kit includes everything that you need to install the hot or cold water to your faucet. Components include: (1) 1/2 in. Nominal Compression Inlet x 3/8 in. O.D. Compression Angle 1/4 Turn Ball Valve with Cross Handle, (1) 3/8 in. O.D. Riser, and (1) Escutcheon. An angle valve is most often used when the water pipe enters the room from the wall. With a 90 degree turn of the valve handle, you are able to stop the flow of water leading to the plumbing fixture, allowing for maintenance and repair without shutting off the water to the entire home. Available in special finishes, this kit is a perfect complement to bathroom decor where the plumbing connections are most often exposed.