Drain traps, screens, strainers, grills, sieves, gratings, baskets or guards of plastic (excluding pits and tanks); plastic drain traps incorporating screens, strainers, grills, sieves, gratings, baskets, guards or filters (excluding pits and tanks), all in this class

Drain traps, screens, strainers, grills, sieves, gratings, baskets or guards of metal (excluding pits and tanks); metallic drain traps incorporating screens, strainers, grills, sieves, gratings, baskets, guards or filters (excluding pits and tanks), all in this class

Filters (excluding pits and tanks); screens and screening systems and equipment relating to waste systems, drainage systems and sewerage systems, the capture and removal of particulates and solids from waste, the pre-treatment of waste, and the decontamination of waste (excluding pits and tanks); filtering equipment (excluding pits and tanks) for use with water, including waste water, and other liquids issuing from household, commercial and industrial floors and sinks; filters as part of household or industrial installations (excluding pits and tanks); all being goods in this class