Features:

Installed on the top of oil tank, manhole can provide function of inside breath and emergency discharge. It can also be used with oil and gas recovery valve, oil-implement hole anti-overflow probe rod and etc. when the oil level reach the preset position during the fuel filling for the tank, the sensing system will alarm automatically to stop filling. The inside breather valve can keep balance between the pressure inside the tank and outside. The slope anti-overflow design can keep the tank sealed in case of accident. The emergency gas discharge device will release pressure inside the tank automatically when the inside pressure increase dramatically to ensure the security of the oil transportation.