The contoured body cross section is commensurate with the contoured wall cross section for inserting and keying {HEAD ~ the housing} into {TAIL ~ the receptacle} 
The contoured body cross section is commensurate with the contoured wall cross section for inserting and keying { HEAD ~ the housing } into { TAIL ~ the receptacle }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL