A waterproofing connector includes a pair of female and male connector housings, one of which has a circumferential space formed inside of an outer surrounding wall of the one of connectors, a rising rear wall defining an end wall of the space and formed with a through-hole, and a packing...http://www.google.com.au/patents/US5779493?utm_source=gb-gplus-sharePatent US5779493 - Waterproofing connector
