I don't know why, but this big complex pipe structure was situated above the urinal. When you flush, the red light goes off and the green light goes on, and all the pressure dials start going crazy.
this post was submitted on 23 Jun 2023
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Grey box is a flow sensor that turns lights on/off. Bell shaped thingy is a pressure reducing valve. Pressure gauges and valves are obvious. Not sure what the last thing is, maybe to prevent hammering?