{HEAD ~ The waterproof cover} is fixed to {TAIL ~ the compressor housing} by a ring shaped fastener  
{ HEAD ~ The waterproof cover } is fixed to { TAIL ~ the compressor housing } by a ring shaped fastener
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH