The PA1124, Automotive Tire Gauge connects directly to Standard Automotive style Stem Valves (Schrader(r) Valves). The standard read-out gives you exact air measurements time after time. This unit does not fit Presta or Woods valves (found on some bicycles).Note: Schrader is a registered trademark of Schrader-Bridgeport International, Inc. Campbell Hausfeld and its products are not affiliated with or endorsed by Schrader-Bridgeport International, Inc.