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A pipe wrench is the tool you reach for when you need to grip round pipe or fittings that a regular wrench cannot bite. The serrated jaws dig into the pipe surface and the adjustable mechanism self-tightens as you pull. This guide covers sizes, materials, and which brands hold up to daily plumbing work.
A pipe wrench is a heavy, adjustable wrench with serrated jaws angled at about 15 degrees. The upper jaw is spring-loaded and adjustable via a knurled nut. When you pull the handle, the angle of the jaws causes them to bite harder into the pipe. This self-tightening action is what makes pipe wrenches grip round surfaces that flat wrenches cannot hold.
These are hand tools. No battery-powered versions exist. Pipe wrenches come in sizes from 6 inches (for 1/2-inch pipe) up to 48 inches (for 3-inch pipe and larger). The two main materials are cast steel (heavier, stronger, cheaper) and aluminum (40% lighter, same jaw strength, costs more). Most plumbers carry a 14-inch and an 18-inch as their everyday pair.
Key specs: overall length (determines leverage and jaw capacity), jaw capacity (maximum pipe diameter the jaw opens to), weight (steel vs aluminum matters over a full day), and jaw material (hardened steel teeth on both types). You always use two pipe wrenches together: one to hold the pipe, one to turn the fitting.
We break down specs, prices, and trade-offs in our best pipe wrenches guide.
The maximum pipe diameter the wrench can open to. A 14-inch wrench opens to about 2-inch pipe. An 18-inch wrench handles 2-1/2-inch pipe. A 24-inch wrench reaches 3-inch pipe. Match your wrench size to the pipe you work with most. Residential plumbing is mostly 1/2-inch to 2-inch, so a 14-inch wrench covers most jobs. Add an 18-inch for larger drain lines.
Overall wrench length determines both jaw capacity and leverage. Longer wrenches grip larger pipe and apply more torque with less effort. But they are heavier and harder to use in tight spaces. A 14-inch wrench weighs 2-3 lbs and fits under sinks. An 18-inch wrench weighs 4-5 lbs. A 24-inch wrench weighs 7-10 lbs and is overkill for anything under 2-inch pipe.
Steel pipe wrenches weigh 40% more than aluminum versions of the same size. A steel 18-inch wrench runs 5 lbs. An aluminum 18-inch wrench runs 3 lbs. Over a full day of plumbing work, that difference compounds. Service plumbers who carry tools up ladders and into crawl spaces increasingly choose aluminum. For a home toolkit, the weight difference is less important.
Steel wrenches (Ridgid, Channellock, Irwin) are cast iron or ductile iron. They are stronger per dollar, widely available, and the traditional choice. Aluminum wrenches (Milwaukee, Ridgid Aluminum) have the same hardened steel jaw inserts but a lighter body. They cost 20-40% more. Both grip equally well because the teeth are the same material. Choose aluminum if you carry the wrench all day. Choose steel if it lives in a toolbox and you pick it up occasionally.
A 14-inch pipe wrench handles most residential plumbing. It opens to about 2-inch pipe, which covers supply lines (1/2-inch to 3/4-inch), drain P-traps (1-1/4-inch to 1-1/2-inch), and water heater connections (3/4-inch). If you also work on larger drain lines or sewer cleanouts, add an 18-inch wrench. Most home plumbers do fine with a 14-inch and an 18-inch pair.
For a home toolkit where the wrench sits in a drawer until you need it, steel is fine and costs less. A Ridgid or Channellock steel wrench at $20-$40 will last decades. For daily professional use where you carry the wrench around job sites, aluminum saves about 2 lbs per wrench. Over 8 hours of plumbing, that adds up. Milwaukee and Ridgid both make aluminum models at $35-$70.
One wrench holds the pipe. The other turns the fitting. If you try to turn a fitting with only one wrench, the pipe will spin in the wall or floor, which can crack joints upstream. The holding wrench goes on the pipe close to the fitting. The turning wrench goes on the fitting itself. They work in opposite directions. This is why plumbers carry wrenches in pairs.
You can, but it will damage them. The serrated jaws leave deep bite marks in the metal. Use a pipe wrench on hex only when the nut or bolt is already damaged or corroded beyond what a regular wrench can grip. For intact hex fasteners, use a proper box wrench, socket, or adjustable wrench. Pipe wrenches are designed for round surfaces where marring is acceptable.
They do different things. A Knipex Cobra is a push-button adjustable plier that grips pipe, hex, and flat surfaces. It is lighter, more versatile, and one-handed to adjust. A traditional pipe wrench has deeper serrations, more leverage, and self-tightens under load. For stubborn, corroded pipe fittings, the traditional pipe wrench grips harder. For general plumbing where you also work on hex fittings and nuts, the Knipex is more versatile. Many plumbers carry both.