Air Alerts fit on the tires like normal valve caps, and calibrate themselves to each tire's pressure (from 10 to 139 pounds per square inch).

Some valve caps have a rubber-washer seal (or a synthetic-rubber-washer seal) inside to help make a hermetic seal (airtight seal).

Elaine reached into a brown leather purse on the chair beside her and drew out an identical valve cap.

Another one went around tightening the valve caps on the tires.

A lock nut to secure the stem at the wheel rim and a valve cap may also be present.

A valve cap from a car tyre (13 mm long) was removed at rigid bronchoscopy.

Incidentally, it is a good idea to make sure that all valves and extensions are equipped with valve caps to keep out dirt and moisture.

Unscrewing the valve cap, he reversed it and jammed it down inside the valve as he let the jack drop the car.

For this reason, never move an oxygen tank around without its valve cap screwed in place.

The discovery by FBI Agents of a yellow substance on the valve cap of the airship between cells 4 and 5 where the fire was first reported.