Device environmental safety tank or pit retaining polluting oil intended for network equipment electricity distribution and particularly tanks or tanks holding oil for electrical transformers, which includes at least one tank or pit reception (1) in particular of flammable chemicals flowing placed under a device containing such products, electrical transformer, means extinction (4) that cover said reservoir or said pit (1), removal means (8 ) an overflow product in the tank or tank receptacle (1) and filtering means (5) of flammable chemicals and separation means (14) of water and flammable chemicals contained in the reservoir or the reception pit (1), said separation means (14) and filtering means (5) connected to a water discharge pipe and It consists of at least one cartridge (6) including a gelling agent.
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