Nickel plated safety locking ball valve for use with fluid lines that require anti-tamper devices fitted. This ball valve has a built in locking plate with an anti slip handle. A quarter turn of the handle opens and closes the valve, and these can be locked in position. This is a full flow ball valve that allows unrestricted fluid flow, and is suitable for use with diesel and water. Safety locking ball valves are not suitable for use as a seacock.