Device for environmentally friendly emptying of operating fluid

The invention relates to a device for environmentally compatible emptying of operating fluid (BF), wherein the operating fluid is removed from operating fluid containers via an emptying opening, wherein the emptying opening has a threaded connection, comprising • a first drive section (A1) suitable for connection with the threaded connection and suitable for opening the threaded connection, • wherein the drive section (A1) has a first opening (Ö1) in order to admit operating fluid (BF) into a discharge channel (AK), • wherein the discharge channel (AK) furthermore has a second opening (Ö2), through which the admitted operating fluid (BF) can exit again, • wherein in the discharge channel (AK) a closure device (VE) is provided, which permits the flow through the discharge channel (AK) only in the direction toward the second opening (Ö2).