The replaceable sludge can is disposed at an opening of {HEAD ~ the bottom} of {TAIL ~ the external container} 
The replaceable sludge can is disposed at an opening of { HEAD ~ the bottom } of { TAIL ~ the external container }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL