Assertion: flue | /r/CapableOf | rust out the water heater
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Source sentences:
text: The drain vent commonly looks like below link in the flue pipe (which may be stainless steel or plastic) - also occasionally used on gravity flues which are external to the building or pass through unheated space, to collect condensation from the flue pipe and drain it off so it does not drain down into and rust out the water heater.