Safety device for avoiding {HEAD ~ entrapment} at {TAIL ~ a water reservoir drain} having a secondary blowing pump 
Safety device for avoiding { HEAD ~ entrapment } at { TAIL ~ a water reservoir drain } having a secondary blowing pump
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH