In the absence of pressurized water flow, the bar magnet drops into {HEAD ~ magnetic field} coupling {TAIL ~ proximity} with the reversing reed switch SW2 
coupling
In the absence of pressurized water flow , the bar magnet drops into { HEAD ~ magnetic field } coupling { TAIL ~ proximity } with the reversing reed switch SW2
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH