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How to fit a mains suppressor?

I have a new mains suppressor (filter unit) to fit to my wd64 hotpoint washer dryer. One end of the cylinder has numbers 1 to 4 to attach to the four wires, live, neutral etc. Can someone tell me which number attaches to which wire please?
W Fowles, July 2010
link Click here to see other fixes for Hotpoint.