Knipex 7 1/4″ Cobra Extra-Slim (ES) Water Pump Pliers. KNIPEX Water Pump pliers offer precise and efficient adjustments directly on the workpiece ensuring a comfortable grip and secure handling. The self-locking feature on pipes and nuts prevents slipping while the hardened teeth provide reliable gripping with minimal wear. The box-joint design enhances stability and the pinch guard protects fingers during use. Made from chrome vanadium electric steel these pliers are forged and multi-stage oil-hardened for durability.