I replaced a 4 year old fountain tip with this and used it for about a month. Poor tip heating and then the tip broke indicating it was already rusted on the inside. The real problem came when I tried to remove it from my Weller iron. It corroded in a soldering iron and was actually welded to the iron. It took a vise, 18 inch pliers and a hammer to finally loosen and eventually pull it out. Use the other 4 in this pack. I have never seen a tip corrode so badly or so quickly and I have been soldering for over 50 years.
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