For all you water junkies I just confirmed that the Koolance flow meter
INS-FM17 Coolant Flow Meter & Adapter Board works with the MCubed Sensor Hub to allow the mCubed T-balancer BigNG to moinitor and shut down the systemin in the event of a pump failure. The flow is the straight thru design and it accepts G 1/4 nozzels. I'm not sure if the readings (LPM) are accurate, the shutdown feature was my concern.