... automotive electronics unit or control module, Vents allow rapid exchange of air in response to pressure changes — in other words, they allow the ... divided into 4 rates ,IP65, IP67, IP68, IP69 protection class,, in line with GB4208-2008/IEC60529: 2001 "Degrees of protection provided by ... "International Maritime Dangerous Goods Code"(IMDG CODE) strict requirements. automotive lamp venting bolt(cap)