Bulk head connectors these days have such high pin counts that even the firewall of a heavy truck simply does not always offer enough space for a connector with >60 centimeters in height. As smaller terminals are not an option because the accepted wire gauge for this type of application is...
Product name:4 Pin Bulkhead Waterproof Connector SP13 Electric Vehicle Connector;Pin number:2 3 4 5 6 7 9 pin;Gender:Male / Female;Connection Type:Threaded Coupling;Body material:Nylon PA66;Insulator:PPS;Contact:Brass with gold plated;Temperature:-40℃-+