BrassCraft 3/8In. OD Female Compression Inlet x 3/8 In. OD Compression Outlet 1/4-Turn Straight Ball Valve controls water flow to household plumbing fixtures. The straight valve is most often used where the water pipe enters the room from the floor. With a quarter 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.