Good afternoon CGDiy, I can confirm that the Brass Tail thread for the Dudley Hydroflo is standard for the UK market which is 1/2" BSP, used for 15mm pipework. European equivalent would be 3/8" BSP used for 10mm pipework. For reference if you need to fit the UK standard 1/2" BSP to a European 3/8" 10mm, a Reducing Coupler would complete the job for you which can be found at Screwfix using code: 51238. Hope this helps? Happy Plumbing, and feel free to let us know how the project went. Best regards, Chris Marsh. Thomas Dudley Ltd.
Answered by: Dudley Sales TDL
Date published: 2020-09-04