The ETA wasn't pushed back, we sold out our first shipment in a few hours last Friday. There is a fair amount being shipped today to resellers, I would check with those guys later this week for stock. We may also be able to get another shipment brought in before that next 2/23 ocean arrives.
Yes, you need to connect one pump's outlet to the other's inlet in back. We will be offering some new fittings soon to do this more easily. For series, you also need to swap the side plug with the included shorter one to combine the tanks. See the user manual for details on that.
Tim
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