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Standard Garden Tap Sizes
In the UK there are several garden tap sizes. Purchasing the correct threaded hose connection is often difficult because the adapters are sized according to the British Standard Pipe standard. The outside diameter of the threaded connection on the tap is NOT the measurement that is relevant because BSP fittings always refer to the internal diameter of the pipe they fit.
The most standard tap thread for domestic taps in the UK is 3/4" BSP. This measures 26.44mm across the outside diameter - roughly 1" The picture shows the measurement for a standard 3/4" tap thread. If your tap looks like this, you have a standard 3/4" BSP tap.
It is a very common mistake to assume that the 1" outside diameter measurement means you have a 1" BSP tap. The 1" BSP size is intended for commercial installations and very large gardens requiring large volumes of water. The diameter of this tap will be well over 30mm.
The 3/4" Gardena tap adapter 6005-20 is likely to be the correct fitting for the majority of gardens. If you have slightly older tap, you may need a 1/2" BSP thread and Gardena supply an adapter to convert the 3/4" fitting to fit these. The older 5/8" threaded tap is very rare and a special fitting would be required to fit, or maybe it's time for a new tap.
You can refer to the table below where we have shown the outside diameter measurement for each UK standard tap size. These sizes will not apply to taps purchased or fitted outside of the UK.
Please remember that the rubber washer is required between the tap and the fitting, and also between the adapter (if used) and the fitting, to ensure that there are no leaks.
1/2" BSP threaded tap measures 20.99mm Outside diameter
5/8" BSP threaded tap measures 22.99mm Outside diameter
3/4" BSP threaded tap measures 26.44mm Outside diameter
1" BSP threaded tap measures 33.25mm Outside diameter