Abstract: The present invention features a reusable, pipe-laying device with an automatically adjustable, self-locking member that will accommodate pipes having different diameter sizes. The pipe-support unit of the present pipe-laying device slidably supports an angled, locking bar that will tangentially engage with different diameter sizes resting on the pipe-support unit, thus locking them in place. The pipe-support unit is disposed on a contiguous shaft to that of a staking shaft. The locking bar is slidable upon the contiguous, supporting shaft, and thus comes into tangential contact with a pipe, as it is lowered into place. The tangential contact provides the means by which pipes of different diameter sizes engage with, and are locked by, the locking bar.