Tire valve stems fit into wheel rims to allow air to pass into tires for inflation. Also called wheel valve stems, tire valves have a tube-like body with an inner core that seals the valve. They typically include a cap for covering the valve to block out debris and moisture. These tire valves are commonly used as replacements for leaky, weathered, or cracked valves. Leaky valves can sometimes be repaired by replacing the tire valve core without replacing the entire valve.