Think like a computer (just for a second). It sees your character. Your character clicks on something. Does your character have the item on its person needed to activate something? In this case, no. You've dropped the item. The computer doesn't "see" it.
Instead, make sure that item is in the inventory of the character whom you direct to click on a specific pipe.
If you want the order of items for clicking, ask further. Hope that helps.
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