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