"'service connection' means a water supply pipe or drainage pipe, or related accessories, extending from a waterworks or waste water works to the curtilage of a premises, and used, or to be used as the case may be, for the purpose of connecting one or more premises with a waterworks or waste water works, and, where used for connecting more than one such premises, it shall extend to the curtilage of the premises which is furthermost from the said waterworks or waste water works;".