On Thu, 17 Jul 2014 12:40:04 -0500, Moe DeLoughan
wrote:

On 7/17/2014 12:14 PM, KenK wrote:
Why? I doubt if they would do much, if any, good if the valve was leaking.
They get in the way when checking air pressure - if they weren't there I'd
likely check more often. All I can think of is to keep dirt out of valves?


If you live in a cold climate, moisture is another reason. You don't
want ice or snow to build up in the valve and maybe end up damaging it
or causing a slow leak.
Or a not so slow leak.