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