"whitfit" wrote
> I have noticed that patch kits sometimes come with a
> little piece of rubber tubing, not unlike thin surgical
> tubing. What is this for?
>
> Toby Whitfield.
www.sheldonbrown.com/gloss_w.html#valve
The little rubber doo-hickey is at the bottom the valve, you
have to force air past the doo-hickey/valve body interface
to get air in the tube. As the pressure in the tube rises,
it becomes difficult to impossible to increase the pressure
further. There were still a few of these around when I was a
kid, I remember hating them.
--
mark