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