Please add this to your order when requesting custom or bespoke work to the sum of £110. This will usually be specified in the item description or stated in communication with us. Please be sure to specify your customisation in your order notes. We use standard 'British Standard Pipe' thread sizes used throughout the sanitary industry. 1/2" for shower hose, valves that screw into sink or basin taps and UK connectors. 3/4" for bath tap rigid tails, valves that fit into bath taps. 1.25" for basin wastes. 1.5" for bath & sink wastes.