If they are siliconed into the tank then that's going to take some serious elbow greese to unscrew. Once/if you manage to unscrew them, replacing them should be as easy as going to the store and buying a new one :-)
.. oh, and a bit of scraping of the old silicone which is fairly easy too. I would not reuse the old bulkheads myself.
Last edited by kien; 11-26-2013 at 01:45 AM.
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