Knipex Cobra Extra Slim Water Pump Pliers 250mm are extra-slim tongue and groove pliers built for service, maintenance, repair, and general trade work where access is the real problem. This is a water pump pliers tool designed for gripping pipes, nuts, bolts, and flat stock in confined spaces. Model Number: 87 51 250 SBA.

What sets this version apart from a standard adjustable pliers design is the jaw shape. The long, narrow jaws and slim head profile give you reach into recessed hardware, crowded assemblies, and equipment with very little clearance around the fastener. If you work around plumbing connections, automotive hardware, machinery, or service panels, that extra access matters more than it sounds on paper.

The push-button adjustment is there for speed, but the fine adjustment range is what makes the tool useful day after day. With 19 adjustment positions, you can dial in the jaw opening closer to the size of the workpiece so the grip feels more secure and the handle spread stays manageable. That makes repetitive gripping less awkward, especially when you're switching between different nut sizes or moving from round pipe to flat material.

Knipex also built these pliers to hold under load. The self-locking action on pipes and nuts helps keep the jaws from slipping once engaged, which means you do not have to squeeze as hard just to stay on the part. The box-joint design with double guide adds stability at the hinge, and the hinge bolt is designed to stay put so the joint does not shift unintentionally while you work.

On flat stock, the three-point rest helps the jaws stay planted instead of rocking around. That gives this hand tool more versatility than a lot of narrow-nose pliers that are good only for round material. The hardened gripping surfaces are made to bite with authority, and the forged chrome vanadium electric steel construction with multi-stage oil hardening is the kind of material and heat treatment you want in a pair of pliers that will see real daily use.

Jobsite practicality is solid here too. The dipped plastic handles keep the tool simple, durable, and easy to wipe down. There is also a pinch guard feature to help prevent your fingers from getting caught as the handles close. At roughly 0.72 lb and 250 mm overall length, it is large enough to generate real leverage without becoming clumsy in a tool pouch or service bag.

This Knipex pliers model is a good fit for technicians, mechanics, plumbers, maintenance crews, and anyone doing repair work in packed equipment or cramped utility spaces. If standard water pump pliers feel too bulky around the hardware you deal with, this extra-slim version solves a real problem without giving up the grip strength that makes Cobra pliers worth carrying in the first place.

Knipex Cobra Extra Slim Water Pump Pliers 250mm are the answer when access is the whole job

If you already like Cobra pliers but keep running into hardware buried behind other hardware, this is the version you grab.

• Who it's for: Techs, mechanics, maintenance crews, and plumbers working around crowded assemblies and hard-to-reach fittings.
• Why it stands out: The slim jaw profile gets where standard tongue and groove pliers cannot, and it still gives you the locked-in Cobra grip people buy Knipex for.
• Worth knowing: This is a single specialized pliers, not a kit, and the real payoff shows up most when space is tight. If you mostly work in the open, a standard Cobra may be enough.

• What kind of tool is this? It is a tongue and groove pliers, also described as a water pump pliers, designed for gripping pipes, nuts, bolts, and flat material.
• What is the jaw capacity? The listed jaw capacity is 1.25 inches.
• What makes this model different from standard Cobra pliers? This version uses an extra-slim head and long narrow jaws for better access in confined spaces.
• How is the size adjusted? The pliers use a push-button adjustment system with 19 fine adjustment positions.
• Where are these made? Source data lists Germany as the country of origin.