20 Plastic storage tanks for coolants; plastic tanks for liquid and gaseous coolants, and parts thereof; plastic boxes for combustion air and parts thereof; plastic supply tanks of plastics for liquids and gases; containers, not of metal, for packaging, storing, and transporting of solids, liquids or gases, and parts thereof, and related non-metal container closures; receptacles, not of metal, for agricultural liquids; environmental protection containers, not of metal, for receiving or reprocessing polluting liquids; plastic container and storage systems essentially consisting of liquid storage tanks and connecting fluid transmission piping, sold as a unit, for fuel additives and fluids for emission control; fuel tanks, not of metal, not for construction purposes; fuel compensation tanks, not of metal; plastic containers for chemicals; storage tanks, not of metal, and parts thereof, for storing liquid fuels; supply and storage containers, not for construction purposes, for liquids and gases, and parts thereof; furniture parts, namely headrest cores, cushions, armrests and knee protection cushions