The MATADOR 0557 0400 water pump pliers, also known as a water pump wrench, is a professional tool for plumbing installations, automotive applications, and general mechanical tasks. This 400 mm pliers comply with the DIN 8976 and ISO 8976 standards, with a jaw capacity of 3/4 inch. Made from robust chrome-vanadium steel, the tool offers exceptional strength and corrosion resistance. Key technical features include fine adjustment via a drag-and-drop mechanism that maintains the set position even after opening, allowing for quick adjustments to different workpiece sizes. The innovative arc-shaped locking adjustment provides a gripping capacity of about 40 percent above the standard requirements of DIN and ISO. The self-locking tooth geometry with additionally inductively hardened teeth ensures a secure, slip-resistant grip on fittings, pipes, and fasteners. The tool features automatic nut width adjustment for efficient operation and integrated nail and wire holders for added functionality. With its compact, narrow profile, this pliers is designed for work in tight spaces and hard-to-reach areas, making it suitable for professional technicians and demanding DIYers. The handles are coated with durable plastic for improved comfort and grip during extended use. This model represents a successor to earlier water pump pliers, offering enhanced precision and reliability for demanding applications where tool performance and durability are critical factors.