KNIPEX Cobra® High-Tech Water Pump Pliers, 250mm (87 01 250) The high-tech water pump pliers — grip quickly, adjust finely. The benefits of working with the Knipex Cobra are plain to see: these water pump pliers are light and stable, can be adjusted on the component quickly at the touch of a button, and are self-locking on pipes and nuts. For pipes, nuts, sleeves and various other components, the professional user applies the Knipex Cobra quickly and accurately with just one hand movement. The spring-loaded hinge bolt locks securely into place without adjusting inadvertently. Thanks to 25-fold fine adjustment, the Cobra can be ideally adjusted to different sizes of component, and this fine adjustment also ensures the distance to the handles remains hand-friendly at every grip width. The Cobra is further stabilised by its box joint design ?