(EN) A snake for installing a cable in a conduit, comprising a body (2, 2', 2'') and a joint (3, 3', 3'') corresponding to the shape of the inner surface of the conduit (8), said body comprising a tubular part (9) which is radially elastic and on which the joint is mounted, and a support part (13, 13', 13'') which is fixed to or integral with the tubular part, the tubular part having a guide surface (14) which is used to guide the snake inside the conduit, the diameter of the guide surface being slightly smaller than the maximum diameter of the joint such that the support part radially deforms the tubular part when the snake passes into deformed parts of the conduit.