I took this pump to replace a frozen PSK2500 on an old Red Sea C-Skim 1800. Turns out this isn't a 1:1 replacement. The main difference is that the PSK1200 is actually more powerful than the original pump. It turns out that's not a problem, but I need to reduce the flow into the skimmer a bit so it doesn't wet the skimmer. I also found that the pump doesn't like it when airflow is restricted. If you don't give him enough air, he talks. I'm not sure if this is normal for pinion pumps, but that's how I noticed it. If you're planning on using this in place of the C-Skim pump, just note that Red Sea went with the original pump to one of their custom adapters (the smaller one on top of the pump. I ended up carefully cutting and expanding the old one Pump Adapter Side If you can find a replacement for the top adapter, this pump should fit snugly.
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