ok , just walk up to the pipe. (get as close as you can on the ledge
then put the mouse on hte pipe.
it turns to the arrows in a circle
then click, when you click it should give you a text message that is your clue.
click again and you will "use" the pipe, and put what ever item goes there automaticly.
but make sure you do it in the correct order, or make sure you have protection from fire
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