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I need to plug 1/8" holes on my returns (one pipe steam system). I assume the returns are iron pipe, similar to the mains, etc. so does that mean I need to use iron plugs? The vents I'm removing certainly are not iron so I would assume it's ok to use a different material. My local hardware store only carries brass plugs in this size but I know I can order the iron plugs online. Does it matter?