Is it useful to have steel balls in the differential exhaust hole of three-wheeled electric vehicle?

Steel ball for exhaust hole of differential of three-wheeled electric vehicle. This is a breathing hole, mainly used to ventilate the rear gearbox. After the rear gearbox is heated, it can ensure the air pressure balance inside, so it is useful.

Electric tricycles belong to non-motor vehicles. When riding, you should consciously abide by the traffic rules and do not allow overloading. Before driving, power, vehicle braking performance and electrical components should be routinely checked.