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Old 06-06-2012, 12:13 AM   #9
DIY
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Join Date: Aug 2010
Location: Etobicoke
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plastic doesn't corrode ... but will if your system isnt bled properly, if there is any air in the lines it will corrode anything in time... however if were talking about structural failure I guess metal will hold up better to the heat... But I havent had to change mine yet so I havent had a chance to see
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