BrassCraft Nominal Sweat Female Inlet x Nominal Sweat Male Outlet Multi-Turn Integral Shut-off Straight Valve with lockshield screwdriver slot is intended for a direct connection to diverters and shower mixing valves. Product designed to allow flow control to shower valve without shutting off water supply to entire home. Connect water lines directly to shower valve or diverter without elbows and nipples. On/off flow control requires a screwdriver for operation. This feature helps protect against tempering and accidental valve operation.