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Pliers wrench buying guide

Updated: October 2026

You are at a bathroom basin with a plated compression nut and a listing that names water-pump pliers and a pliers wrench in one line. Those names describe different jaws. A pliers wrench has smooth faces that stay parallel, set by a push-button, so it turns flats the way a spanner does. This pliers wrench buying guide checks the jaw first, then the millimetres across the flats you own. Prices sit in the [pliers wrench comparison](/hub/pliers/pliers-wrench). The Products Compared editorial team read the UK listings on 16 October 2026. A purchase through a link can earn a commission.

You are at a bathroom basin with a plated compression nut and a listing that names water-pump pliers and a pliers wrench in one line. Those names describe different jaws.

Our top picks

WORKPRO WORKPRO 180 mm pliers wrench

Best overall

WORKPRO WORKPRO 180 mm pliers wrench
8.5/10about £16.99
View offer
WORKPRO WORKPRO 100 mm mini pliers wrench

Alternative

WORKPRO WORKPRO 100 mm mini pliers wrench
8.2/10about £16.99
View offer
WORKPRO WORKPRO 180 and 250 mm pliers wrench set

Preis-Tipp

WORKPRO WORKPRO 180 and 250 mm pliers wrench set
8.3/10about £29.99
View offer
On this page
  1. 1.What you are actually buying
  2. 2.Match the opening to the flats
  3. 3.100 mm, 180 mm, or 250 mm
  4. 4.Listings to leave on the shelf

What you are actually buying

You are buying smooth, parallel faces and a button that moves them from one width to the next. Knipex set that pattern with the 86 series, and CIPHE still describes 180 mm as the everyday sanitary size, up to 40 mm across flats. A water-pump plier bites with teeth and belongs on round pipe. PrimeTools files the Knipex pliers wrench under a water-pump heading. Serrated faces in the photo mean a different tool, even when the title says plumber's wrench. ISO 5743:2021 does not treat a plastic coating as insulation, and none of these five tools states VDE or IEC 60900. The best pliers wrench page names a top pick after the jaw check.

Match the opening to the flats

Match the opening to the flats, not to the pipe size. BuildWiz puts a 15 mm compression nut at about 24 mm across flats and a 22 mm nut at about 32 mm. A claimed maximum is a ceiling. One shared WORKPRO review says the tool manages 32 mm and not 40 mm fittings. The WORKPRO 100 mm claims 20 mm. The 180 mm claims up to 40 mm at £16.99. The 250 mm claims up to 50 mm at £19.99, while its style line says 255 mm. The set is both lengths at £29.99. A 22 mm nut needs the 40 mm class. If you do not know which nut is next, the set is one purchase. The squeeze against a worm-screw spanner is on the pliers wrench versus adjustable spanner page.
WORKPRO WORKPRO 180 mm pliers wrench

Testsieger

WORKPRO WORKPRO 180 mm pliers wrench
8.5/10about £16.99
View offer

100 mm, 180 mm, or 250 mm

A 100 mm pliers wrench is a pocket tool. This WORKPRO weighs 68 g, claims 14 positions, and one UK reviewer measured about 19 mm with the handles fully closed. It suits a small gland. It is a poor only-tool for a basin, because 24 mm and 32 mm across flats both sit above a 20 mm claim. The bullets describe one tool. CIPHE treats 180 mm as everyday sanitary work. That length lists 240 g. The 250 mm is the longer lever at 477 g, with a 50 mm claim. Leave the mini if the next job is a standard compression nut.

Listings to leave on the shelf

Leave a listing whose photo shows teeth. Serrated water-pump pliers do not turn a nut on smooth parallel faces. Leave a page that cannot agree with itself. The NUTKIT title says 180 mm and 40 mm, a bullet says 50 mm, the dimension line says 18 by 18 cm, and one of six UK texts refers to 255 mm. Do not plan a job around a capacity the page has not chosen. The arrival check is the button and whether the jaws meet. If the faces do not close, the Consumer Rights Act 2015 is the route. Return it before it touches a finished fitting.

Common questions

Is a pliers wrench the same as water-pump pliers?
A pliers wrench has smooth jaws that stay parallel and a button that sets the width, so it turns a nut. Water-pump pliers use serrated teeth and a groove or box joint, and they grip round pipe where a mark is acceptable. PrimeTools lists a Knipex pliers wrench inside a water-pump category. If the faces are toothed, it is the other tool.
Do I need 180 mm or 250 mm for home plumbing?
CIPHE treats 180 mm as the everyday sanitary size, up to 40 mm. A 22 mm compression nut is about 32 mm across flats, inside that claim and outside a 20 mm mini. Choose 250 mm for a larger nut or more leverage. The WORKPRO title says 250 mm and the style line says 255 mm. If you do not know which nut is next, the £29.99 set is both lengths.
Will a 100 mm tool turn a 22 mm compression nut?
Plan on a larger tool. The 100 mm WORKPRO claims 20 mm, and one UK reviewer measured about 19 mm with the handles fully closed. BuildWiz puts a 22 mm compression nut at about 32 mm across flats. A 15 mm nut at about 24 mm is already above 20 mm. A basin nut needs the 180 mm class.
Why do some titles say both wrench and water-pump pliers?
Sellers stack search words. The NUTKIT listing uses both names, and its browse rank sits under tongue-and-groove pliers, while the bullets describe smooth jaws for coated parts. Trade catalogues do the same mix. Open the photo. Teeth mean a different purchase. Smooth and parallel means you can stay and check the opening against the flats you own.
Does a plastic handle mean the tool is insulated?
A plastic handle is a grip. ISO 5743:2021 does not specify insulating coatings. None of the WORKPRO or NUTKIT listings compared here states VDE or IEC 60900. CIPHE names Knipex 86 06 250 as the VDE model in this family, and that model is not in this comparison. These grips are not a reason to work on live conductors.
Should I trust a page that claims two different jaw openings?
Treat the conflict as the useful fact. The NUTKIT page says 40 mm in the title and 50 mm in a bullet, and the dimension line does not settle the length. A capacity you cannot pin down is not one you can match to a 32 mm nut. If two numbers disagree, measure the tool when it arrives.

Related pages

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Best pliers wrench UK: top pick and best-value set

How to use a pliers wrench: button then the stroke

Pliers wrench vs adjustable spanner: the jaw split

Sources

Knipex product pages, HSE, and ISO, checked on 16 October 2026. Shelf prices and star lines are the amazon.co.uk figures in the display file.

  1. Knipex 86 03 180 pliers wrench (retrieved 16 October 2026)
  2. Knipex 86 03 250 product data sheet (retrieved 16 October 2026)
  3. Knipex pliers wrench family data sheet (retrieved 16 October 2026)
  4. HSE: PUWER overview (retrieved 16 October 2026)
  5. ISO 5743:2021 pliers and nippers (retrieved 16 October 2026)
  6. amazon.co.uk: Knipex 86 05 180 (retrieved 16 October 2026)
  7. Screwfix: Knipex pliers wrench 180 mm (retrieved 16 October 2026)
  8. BuildWiz UK: strap wrench (retrieved 16 October 2026)