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DE540X dishwasher?

On the inner left hand wall of my recently acquired (not new) dishwasher there is an orange plastic cap. As I haven't got the original owners handbook can someone please tell me what this cap is for?
Any advice gratefully received
Su Roberts, February 2010
Its the water hardness and should be factory set to 2.
if you want a full instruction manual go to
www.serviceforce.co.uk and you can download one for FREE

ck, February 2010