I just purchased online the Tunze 2 powerhead 6101, but I thought I was purchasing the 6105. What is the difference? Should I send it back? Can I just upgrade?
6105 are round like a ball, 6101 are more rectangular, there are quite a few differences and it isn't cheap to upgrade. The 6101 hasn't been made for a bit over a year so if these are new pumps I am a bit surprised. Does it actually say 6101 on the pump itself or are they just packed in a box that says 6101 and are used pumps?
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