An apparatus for suspending a prosthesis from a residual limb comprises a tubular liner adapted to receive the residual limb. A lanyard is secured at one end to the distal end of the liner. A hollow prosthetic socket defines a well configured to receive the residual limb and includes a socket seal disposed at the distal end of the socket. An upper surface of the socket seal defines a recess opening to the exterior of the socket through a side wall. A sealing element disposed along the length of the lanyard is configured to engage within the passage. The free end of the lanyard is pulled through passage such that the sealing element sealingly engages within the passage for preventing fluid communication through the passage. The liner at least partially contacts the interior surface of the socket for providing a fluid seal and creating negative pressure within the socket.