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Guillemin couplings explained: the French symmetrical coupling and its lock ring

Guillemin is the symmetrical half-turn coupling of French fire and industrial water service. How it connects, what the lock ring is for, and how to order the right tail.

Written by
Ayush Bhatia, Director
Published
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4 min · 3 sections
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Two symmetrical Guillemin couplings being joined by hand on an industrial water hose
Guillemin couplings are symmetrical, so any two of the same size join by hand.

At a glance

Key takeaways

  1. Guillemin is symmetrical: identical heads lock together, so any two heads of one size connect.
  2. Our Guillemin couplings are Sunpool's, from 3/4" to 4", in aluminium or stainless steel. Sunpool does not state which standard they are made to or publish a working pressure, so we confirm it for your duty.
  3. The lock ring stops a connected pair rotating apart; versions with and without it are listed.
  4. Tails: long or short hose shank, spiral hose tail, male thread or female thread (BSP or NPT), plus reducers and dust caps.
  5. It does not connect to a Storz or Barcelona head without an adapter, although all three are symmetrical.

Figures verified · Sizes, materials, rating, lock-ring options and standard checked against our Guillemin listings.

Guillemin is to French industry what Storz is to German: a symmetrical coupling that removes the male-female problem by making both halves the same. It is the standard head on fire and water hose across France and the francophone markets we ship to, and it turns up on European tankers and plant hose wherever a French specification was written. The things worth knowing before ordering are the lock ring and the tail — the face looks after itself.

/01Two identical heads.

Each Guillemin head carries a gasket and a set of ramps and claws on its face. Two heads of the same size are offered face to face and turned against each other; the claws ride up the ramps and pull the gaskets together. Because every head is identical, a reel of hose can be joined in any order and a spare head fits either end. That symmetry is the reason symmetrical couplings dominate fire service — at a hydrant nobody wants to be holding the wrong half.

/02The lock ring.

A connected Guillemin pair is held by friction and the cam of its claws. On a hose that is dragged, twisted or vibrated, that can unwind. The lock ring is a rotating collar that, once set, stops the heads turning back. Our listings carry heads with a lock ring on the hose-shank, spiral-tail and male-thread versions and the dust cap, and adapters without one; on any hose that moves in service, the ring is worth specifying.

/03Choosing the tail.

Guillemin parts in our range (3/4" – 4")
PartBack endLock ring
Coupling, long hose shankHighlightedBarbed shank for bandsYes
Coupling, short shankShort barbed shankYes
Coupling, spiral hose tailTail for spiral suction hoseYes
Coupling, male thread × spiral tailMale threadAs listed
Adapter, male threadMale BSP or NPTWith or without
Adapter / coupling, female threadFemale BSP or NPTAdapter: without
Reducing adapterGuillemin face, two sizes—
Dust capSolidYes

The spiral hose tail is made for suction hose with a rigid helix, where a plain barb would not seat. Reducers join two Guillemin sizes directly — our listing runs from 1-1/4" × 1" to 6" × 4". Sunpool publishes no working pressure for the range, and the gasket sits in the face of each head.

Frequently asked questions

Is a Guillemin coupling male or female?
Neither. Guillemin is symmetrical: every head is identical, so any two heads of the same size lock together.
Which standard covers Guillemin couplings?
NF E 29-572 is the French standard for the Guillemin system. Sunpool does not state which standard its parts are made to, so tell us if your specification names one.
Does a Guillemin coupling connect to a Storz coupling?
No. Both are symmetrical, but the faces are different patterns. Joining them needs an adapter with one face of each.
What sizes and materials are available?
Our listings run from 3/4" to 4" in aluminium or stainless steel, with reducing adapters up to 6" × 4". Sunpool publishes no working pressure for them, so we confirm it for your duty.

Guillemin couplings and adapters

What next

  1. 01

    Find the part

    CatalogueGuillemin couplingsGuillemin heads, adapters, reducers and caps, 3/4" to 4".CatalogueStorz couplingsThe German symmetrical coupling, sized by lug distance.
  2. 02
  3. 03

    Where we supply this hose

    For chemical, food-grade, steam and water hose the certificate is most of what the buyer is actually purchasing, so it is prepared before dispatch rather than chased afterwards. We ship this class of hose from Dubai into plants audited against the same standards we quote to, with the documentation attached to the consignment and referenced on the invoice.

    GCC & Middle East

    North America & Caribbean

    South-East Asia

    North Africa

    Everything above ships from the same Dubai warehouse. If your destination is not listed, it is almost certainly still one we quote. See every export destination

Supplying a French specification?

Tell us the hose bore, the tail you need and whether the joint must lock. We will quote the heads, adapters and caps, and an adapter to whatever the other end runs.

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