I'll try to clarify it:
we have the splitters YL2-1 and YL2-2.5, one is 1m long, the other is 2.5m
They have the same function: Just double the ports, no crossover
The splitters are suitable for lighting and pump control
If you want to connect two controllable pumps on one port (eg L1L2) you need: 1 splitter, 1 cable ProfiLux<->Tunze1 (the pump connected over this cable will react on L1) and 1 cable Profilux<->Tunze2 (reacts on L2)
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