This document classifies floor gullies for use inside buildings, gives guidance for places of installation and specifies requirements for the construction, design, performance and marking of factory made gullies for buildings, irrespective of the material, for use in drainage systems requiring a trap with a mechanical closure (referred to as floor gullies). NOTE Floor gullies with a mechanical closure are not covered by Part 1, Part 6, Part 8. These products are intended to be installed where: the building does not exceed a ground-floor and three floors above; infrequent use could result in a water seal evaporating.