Hopper heads — box- or funnel-shaped receptacles at the top of downpipes — were sometimes adorned with the initials of the person who had the house built and the date of its construction.
Weithiau câi dalwyr dŵr, sef cynwysyddion sgwâr neu gynwysyddion siâp twndish ar ben pibellau dŵr, eu haddurno â blaenlythrennau enw'r unigolyn yr adeiladwyd y tŷ ar ei gyfer a'r dyddiad adeiladu.