The Dunlop valve, is a type of pneumatic valve stem

Valve stem

A valve stem is a self-contained valve which opens to admit gas to a chamber , and is then automatically closed and kept sealed by the pressure in the chamber, or a spring, or both, to prevent the gas from escaping...

 in use in some countries, such as Japan, Czech Republic, Poland, Russia, the Netherlands, Germany, Britain, Finland, Sweden, and developing countries

Developing country

A developing country, also known as a less-developed country, is a nation with a low level of material well-being. Since no single definition of the term developing country is recognized internationally, the levels of development may vary widely within so-called developing countries...

. It has a wider base than a Presta valve

Presta valve

The Presta valve is a valve commonly found in high pressure road style and many mountain bicycle inner tubes. It comprises an outer valve stem and an inner valve body...

, similar in size to a Schrader valve

Schrader valve

The Schrader valve is a brand of pneumatic tire valve used on virtually every motor vehicle in the world today. The Schrader company, for which it was named, was founded in 1844 by August Schrader...

, but it can be inflated with Presta valve adapter. The inner mechanism of the valve can be replaced easily, without the need for special tools.