BrassCraft® 1/2 in compression inlet x 3/8 in outer diameter compression outlet multi-turn straight valve with lockshield and loose key controls water flow to household plumbing fixtures - faucets, toilets, dishwashers, icemakers, washing machines and more. The straight valve is most often used where the water pipe enters the room from the floor. With a few turns of the key, you are able to stop or start the flow of water leading to the plumbing fixture, allowing for maintenance and repair without shutting off the water to the entire home. Valve features lockshield with a loose key to help protect against tampering and accidental activation.