Abstract: A pig for conveying a working medium inside a feed line comprises a pig body which can be driven inside the feed line by a pushing medium and which has on one front side a projection with a free front surface. The pig also contains at least one first and one second circumferential sealing element arranged on the pig body which are made of elastomeric material and which are at a distance from each other in the direction of the longitudinal axis of the pig body and which run coaxial to the longitudinal axis of the pig body. The sealing elements can be pressed against the inner wall of the feed line, in that the working medium or the pushing medium bears against a contact surface of the respective sealing element. The contact surface of the sealing element neighboring the front side with the projection is smaller than the contact surface of the other sealing element.