This is a slightly confusing question.
It's in the plumbing category
You talk of either the washer of a temperature control knob - or -
The temperature control knob of a washer (washing machine perhaps)
The flippant answer is of course - remove the old and fit the new - but you probably know this yourself.
The make and model of the equipment would help a lot - don't you think? Also the specific issue you're having with whatever it is.
Have another try, February 2015
