Dunlop valve bicycle pumps

Dunlop

— an outdated type of nipple, once widely used in Soviet bicycles. It has a diameter of about 8 mm and thinning at the end; between the thick and thin part there is a washer, when unscrewing which the valve opens and the air comes out of the wheel. Bicycles with a similar nipple are almost never produced, however, there are many old, but quite functional units, so Dunlop compatibility is still found in modern bike pumps.