The delaune brass shower wall elbow outlet for concealed shower systems is available with a standard ½" BSP outlet for all standard shower hoses. It also has a 41.5mm ½" inlet thread with locking nuts for the reverse of board & tiles. The 48mm backplate is also large enough to give a great sleek-looking design & is big enough to cover that inlet hole. Delaune round brass shower wall elbow outlet high-quality matt black finish standard ½" BSP outlet, compatible with all standard shower hoses 41.5mm ½" inlet thread with locking nuts 48mm square backplate.