Tube Adapter facilitates the correct static alignment of lower limb prostheses during the trial fitting. Tube fittings connect runs of tubing (for in-line, offset, multi-port, and mounting configurations) to other components. Reproducible adjustments make it possible to optimize gait during the trial walking. The length adjustable tube adapter is mounted between the prosthetic foot and the knee joint. Tube lengths are adapted for use between the prosthetic foot and the knee joint. The total length of the tube adapter can be adjusted with a tube clamp. The outer and inner rotation of the foot is also adjustable.