ARO 210 / A-style air coupler (1/4" ARO 210 (Type A))

Used on: ARO-equipped shops and many industrial air systems that standardised on the 210 profile.

The ARO 210 looks almost identical to the Industrial / Milton profile but its pilot is longer and its ball groove is nearly round, so the two do not interchange. Parker 50, Hansen 210 and Tomco 100 couplers all mate with an ARO 210 plug.

Quick-connect click fittings from Hozelock, Gardena and Karcher are proprietary and do not interchange. They all sit on top of a standard thread underneath, so the reliable way to move between brands is to adapt at the threaded tap or hose-end fitting, then use each brand's own connector above it.