BrassCraft 1/2 in. Nom Compression Inlet x 3/8 in. OD Compression Outlet Multi-Turn Straight Shut-Off Valve with Cross Handle. This shut-off valve controls water flow to household plumbing fixtures including faucets and toilets. The straight valve is most often used when the water pipe enters the room from the floor. With a few turns of the valve handle, 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. Available in special finishes, this valve is a perfect complement to bathroom decor where the plumbing connections are most often exposed.