The Knipex Cobra 12 in. Water Pump Pliers, model 87 02 300 SBA, are heavy-duty adjustable pliers built for gripping, turning, and holding pipe, fittings, and large fasteners. This is a water pump pliers tool designed for gripping pipes and nuts with high holding force. If you need more reach and capacity than a smaller pair of tongue and groove pliers can deliver, this 300 mm Cobra steps up without turning into a bulky specialty tool.

What makes this model matter on the job is the combination of fast adjustment and secure bite. The push-button mechanism lets you set the jaw directly on the workpiece, and the fine adjustment helps dial in the fit so the handle width stays comfortable in hand. Once set, the self-locking action on pipes and nuts reduces slipping and cuts down the squeeze force you need to keep control. That is a real advantage when you are breaking loose tight plumbing connections or holding larger hardware in place.

Capacity is where this size earns its keep. The 12 in. length gives you solid leverage, while the jaw handles round pipe up to 2-3/4 in. and nuts up to 60 mm. Knipex also lists 30 adjustment positions, which gives this pair the range to cover a lot of service and install work without needing to switch tools constantly. Compared to a conventional pipe wrench, this style is quicker to reposition and easier to carry for general service work.

Construction is straight from the Knipex playbook: chrome vanadium electric steel, forged, then multi-stage oil-hardened. The gripping teeth are specially hardened to about 61 HRC for better wear resistance, which is why these pliers keep biting after a lot of use on metal fittings and hardware. The box-joint design uses a double guide for added stability, and the hinge bolt is retained so it does not shift unintentionally during use.

Jobsite practicality is also well thought out. The multi-component comfort grip helps the tool stay planted in your hand, and the built-in pinch guard gives your fingers a little insurance during adjustment and closing. These are not insulated pliers, so they are meant for mechanical, plumbing, maintenance, and general repair work rather than live electrical work.

Bottom line: this size is a smart pick for plumbers, maintenance techs, mechanics, and serious DIY users who regularly work on larger pipe, valves, unions, and oversize nuts. If a standard 10 in. pair feels undersized for what you do, but a full pipe wrench is more tool than you want to carry all day, the Knipex Cobra 12 in. Water Pump Pliers land right in the sweet spot.

Knipex Cobra 12 in. Water Pump Pliers Are The Right Upgrade From Basic Tongue And Groove Pliers

If you use adjustable pliers often enough to notice the difference between decent and dialed-in, this pair earns its spot fast.

• Who it's for: Plumbers, maintenance techs, mechanics, and serious DIY users who need more capacity and leverage than a smaller pair can offer.
• Why it stands out: The push-button adjustment is quick, the self-locking bite works, and the hardened teeth plus forged construction are why these hold up in real service work.
• Worth knowing: These are not insulated, and they are a single-tool purchase. But if your day involves larger fittings and stubborn hardware, this 300 mm size is one of the most useful Cobras in the lineup.

• What is the maximum pipe capacity? The pliers handle round pipe up to 2-3/4 in.
• Are these insulated for electrical work? No. The handles are comfort grip, not insulated.
• How are they adjusted? They use a push-button adjustment with fine positioning and 30 adjustment settings.
• Where are they made? Germany.