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The manhole covers installed on the top of tank, it has built-in respiration and emergency exhaust function. We can also install the gas collection valve?dip hatch?feeler lever etc. on the manhole.The electronic sensor will alarm and cut off when oil reach the warning position.The built in respiration vavle can be on and off according to gas pressure, it is the valve to keep the gas pressure within bounds.Auxiliary openings can install dip hatch?protection against overflowing feeler lever?gas collection valve.