KWIK CHANGE brand Tire Relief kit for race wheels.  Complete with bleeders, wheel inserts, and gauge.  0-30 lbs. guage.  NICE. 

KWIK CHANGE Tire Pressure Relief Valves

Relieves tire pressure buildup as you race - automatically.

Use with quick change adapters or mount directly in your wheels by drilling a 1/8" NPT thread hole.

• 3-30 psi range
• Lightweight aluminum - only 9 grams - won't affect wheel balance

See other parts in my store.