Jubilee clip size 0X (0X (18 to 25 mm OD))
Where 0X (18 to 25 mm OD) is used, its real dimensions, and how to connect it.
Used on: clamping small garden and appliance hoses in the 18 to 25 mm outer-diameter band.
A Jubilee size 0X clamps hoses of 18 to 25 mm outside diameter. Measure the hose once it is pushed onto its barb or spigot, because it swells slightly, and pick the size where your reading sits mid-range rather than at the very end.
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.
Connect this fitting
Sources: Jubilee Original hose clip size chart (clamping OD ranges in mm), Jubilee Clips · Jubilee clip sizes and how to size by hose OD, The Hosemaster