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The part that you seek is available from this company -- http://www.keepuswarm.com/Online-Store.html -- hope that helps the manual lists the 6118 as being the item for the 422 but I note that this supplier has it as 6186 maybe an upgrade/replacement. They are very helpful and worth a call if you are unsure - Ian
Leave it with me - I'll check with them and come back to you later.