Machine coupling and transmission components (except for land vehicles); filtering machines used in sewage and waste water handling; separators; sewage pulverisers; transporting machines for sewage; washing apparatus for sewage treatment plants; non-return valves of plastic [parts of machines]; electric pumps; rainwater harvesting and filtration machines; pumps and compressors as parts of machines; linear compressors being machines; vibration reduction parts for compressors, pumps and machines; parts and fittings for all the aforesaid goods; all of the aforesaid being for use in the field of sewage and waste water treatment, disposal and handling.