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installed on the top of oil tanker and used for injecting oil,checking gas recovery,mending the internal inlet.

also can protect the tanker under the emergency.

when inject oil,the outside temperature's change will lead the tankers inside pressure to change.

then the manlids breathing valve can automatically makethe tanker pressure to the normal level.  If some emergency happen,like the tanker overturn,the breathing valve will automatically close to avoid the tanker's explosion when under the fire condition.