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Experienced that too with the metal housing. I called coralife and they replaced the piece for me.My experience only...take for what it is. Perhaps that piece is no longer there since it was three years ago. I had a full sps tank crash due to a coralife UV 18 watt. There is a cheap metal ring that they use in the internal housing that is not saltwater proof and that corrode and rust over time...6 months. I could not figure it out until I shut down my system and took it out to clean and figured it out. I now use Aqua UV...can't go wrong with that brand.

