The hose coupling is the metal piece on the end of a hose to connect it to extra hose or hose appliances. It is usually made of steel or brass. The hose coupling comes in several different styles:

Storz coupling

Storz connection on a standpipe.

A "quarter turn coupling", or "sexless coupling", commonly used to connect to fire hydrants, easy to connect, no particular male or female end, locks are on inside of coupling.

See Storz.

Nakajima coupling

Another "quarter turn" or "sexless" coupling, similar to Storz coupling, but not used as often. Main difference between these and Storz are that this has locks on the outside.

NST coupling

Side view of a 1.5 inch to 2.5 inch adapter.

The most common type of coupling. The male and female threads screw together.

Guillemin symmetrical clutch

The Guillemin symmetrical clutch is widely used in France. It is the coupling used by the french firefighters.

It can be fastened by hand, but it is also possible to use a tricoise wrench. It is also "quarter turn" and "sexless" (symmetrical).

Each end has a ring with two protuberances outside; when the ring turns, the protuberances lock to the hook of the other hose.

Barcelona coupling

It is the coupling used by the Spanish firefighters. It is the obligatory sistem in Spain for firefighting.

The male and female threads screw together.

Source: adapted by the editor from Wikipedia, the free encyclopedia; from the article "Hose coupling". Image Credit.

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