Hose coupling

A hose coupling is a connector on the end of a hose to connect (or couple) it with another hose or with a tap or a hose appliance, such as an irrigation sprinkler. It is usually made of steel, brass, stainless steel, aluminium or plastic.

The "Air King" universal air hose coupling, also known as a "Chicago style" fitting, is malleable iron or brass "quarter turn" "sexless coupling" usually found on large pneumatic tools like jackhammers. The fitting is considered "universal", because a common two-lug head is used on all sizes ranging from 0.25 to 1 inch (6 to 25 mm).

This coupling is used by Spanish firefighters. It is a sexless coupling with three engaging lugs.

A cam and groove is a quick connect fluid transfer hose coupling that consists of a male "adapter" and female "coupler". The adapter has a groove on the outside that is engaged by the "cam arms" on the outside of the coupler to effect a seal against the gasket inside the "coupler". They are commonly used for petroleum or chemical applications.

An expansion ring fire hose coupling is commonly used on lay-flat fire hose. It has the advantage of providing no flow restriction, as the expansion ring is expanded to match the inner diameter of the hose. It is installed with special machinery using a drawbar expander. In the United States, it is most commonly supplied with NST (NH) threads.

This is kind of symmetrical half coupling for water and air use. The most popular standard is NF E 29-573.

Operation of this kind of coupling is pushed two couplings and rotate close into a seal form. It is popular in France area and European market with brass and stainless steel.

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