IMPA 872363 Air vent head is a Marine aluminum alloy air vent head suitable for oil or water tanks. When the external environment is harsh, the sea water or rain enters the floating ball air cap, and the floating ball will be lifted when it is too late to discharge. After the float is lifted, water cannot enter the inlet air pipe, thus isolating the possibility of entering the cabin. This floating ball type air vent head can be automatically closed through the PE plastic float ball, so it is also called the self-closed floating ball type aluminum alloy oil/water tank air vent head.