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A plumber wrench (or plumber's wrench) is a pipe wrench used to rotate pipes used in plumbing. The wrench is adjusted to different pipe diameters by rotating the key ring (silver in the picture). The tool does not need to engage a nut and can grip with significant force, but with careless use it is possible to dent or break the pipe. The wrench can still be used on a pipe with a nut or other flat engagement points.
Being relatively large and unwieldy, it is only used when the ordinary wrenches are not suitable.
The plumber wrench was invented in the year 1888 by Swedish inventor Johan Petter Johansson (who also held an 1891 patent for an improved version of the adjustable spanner). His wrench, which shares some principles with both the Stillson-pattern pipe wrench and the rigid pipe wrench, is nevertheless a decidedly different tool. Though not widely known in North America, it is commonly found in Europe, where it may be called a "pipe wrench", "Swedish wrench", or "Swedish pattern wrench".
- "Wrenches and accessories". Atesina S.p.A. Retrieved 2015-03-08.
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