2 overflows with U tube for sale/trade

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I have two overflows one has a bulkhead out the back, I dont know why but that is how I got it. The other one is normal both have the U tube. I believe both of these are 800 GPH. I just sold my non reef ready tank and sold it with a hang on skimmer instead of these so nothing wrong, I just dont need them. Will trade for coral or ? Carrie