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Woods Valve
A type of valve very rarely seen in the U.S., which has a bottom similar to a Schrader and necks down to about the size of a Presta is the Woods valve, also known as the "Dunlop" valve. Woods valves were formerly popular in the British Isles and Asia. You can pump them up with a Presta pump.
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| Woods valve | Schrader valve | Presta valve |
Older versions work with rubber tubing and spit. If they don't hold air, you can unscrew the knurled ring that holds the valve core (the "Presta-sized" part) in place. You should see a short length of rubber tubing covering the inner part of the core. If the rubber tubing has deteriorated,, the valve won't work. Some patch kits include short lengths of replacement rubber tubing for this purpose. When installing new tubing, lubricate the valve core with spit before slipping the tubing in place.
Newer versions use a modern spring-loaded valve mechanism.
