Jubilee clip size 1A (1A (22 to 30 mm OD))
Where 1A (22 to 30 mm OD) is used, its real dimensions, and how to connect it.
Used on: clamping 20 mm pond hose and similar over a hosetail in the 22 to 30 mm band.
A Jubilee size 1A covers 22 to 30 mm outside diameter, which suits 20 mm bore pond hose once it is stretched over a hosetail. The continuously threaded band lets it tighten fully across the range, unlike a spot-welded clip.
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