The inner surface of {HEAD ~ a power supply side connector} is covered with {TAIL ~ a circular waterproofing packing} 
The inner surface of { HEAD ~ a power supply side connector } is covered with { TAIL ~ a circular waterproofing packing }
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL