Jubilee clip size 1X (1X (25 to 35 mm OD))
Where 1X (25 to 35 mm OD) is used, its real dimensions, and how to connect it.
Used on: clamping 25 mm pond and pump hose over a hosetail in the 25 to 35 mm band.
A Jubilee size 1X clamps 25 to 35 mm outside diameter, the usual choice for 25 mm pond hose once it is on a hosetail. If your measured outside diameter is near the very top of a size, step up rather than run the clip out to its last thread.
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