Water pump pliers are a multi-purpose hand tool commonly used for turning and holding nuts and bolts, gripping irregularly shaped objects, and clamping materials. Also known as tongue-and-groove pliers, adjustable pliers, groove joint pliers, slip joint pliers, pipe spanner, multi-grip pliers and Channellock pliers.
Water pump pliers have a slip-joint with serrated jaws generally set 45 to 60-degrees from the handle. The lower jaw can be adjusted to various positions by sliding along a tracking section under the upper jaw, to create different jaw spans.
Water pump pliers are typically machined from steel and the two handles precisely joined. Levers options include 1000 V ac insulated, bi-material or plastic sheath.
Although water pump pliers get their name from being used to tighten the packed glands in water pumps in cars and vans, they can be used for gripping nuts and bolts with a large round or square diameters and other irregular shaped objects. As such, they are suitable for many applications wherever a tight grip and leverage are required. They are sometimes known as water pump pipe wrenches.