Elevated vacuum locking system

A double-wall socket system comprising:

• a flexible liner shaped to accept a portion of a residual limb;
• a plunger pin mounted to a distal end of the flexible liner;
• an inner socket shaped to receive the flexible liner and the residual limb;
• an outer socket shaped to receive the inner socket, the flexible liner, and the residual limb, the outer socket having a modulus of elasticity that is greater than a modulus of elasticity of the inner socket;
• a locking mechanism mounted at least partially within the inner socket approximate a distal end of the inner socket, the locking mechanism including a central opening sized to receive the plunger pin, the locking mechanism releasably engaging the plunger pin when the residual limb and the flexible liner are inserted into the inner socket;
• and
• a manifold mounted to a distal end of the outer socket, the manifold including
• a cavity generally aligned with the central opening of the locking mechanism, the cavity being adapted to receive a distal end of the plunger pin when the residual limb and the liner are installed into the inner socket, and
• a through passage fluidicly connecting an interior of the cavity to a fitting on an exterior of the manifold, the fitting being configured to be connected to a vacuum pump for withdrawing air from the double wall socket system through the cavity and the through passage of the manifold.