TheCTA Tools Straight Lock-on Air Chuck Open-Flow, No. 6525, is engineered to deliver nearly instant airflow for fast fill ups. The open design eliminates restrictive valves that slow users down, while open-flow delivers speed and allows air to flow back out when disconnecting. For controlled inflation, users can pair the chuck with an inflator that has an electric shut-off valve. This tool features a 1/4" female NPT and a 3/4" hex.