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