Lincoln coupler fits all Automotive/Tru-Flate, ARO and Industrial/Milton style Nipples for 1/4" ID Hose, 300 psi max operating pressure. 1/4" NPT(f) Inlet. Max airflow is 38 SSCFM at 100 psi. Coupler and Nipple can be joined without user pulling back on the Sleeve. A TRUE quick connect design!