Sub-soil drainage piping

Claim 1

A sub-soil drainage pipe segment which has connecting formations at opposite ends thereof, whereby a number of such segments can be interconnected end-to-end to form a sub-soil drainage line, the segment further having a plurality of circumferentially spaced, longitudinally extending slots therein which render the segment water-pervious, wherein the connecting formations are complementary spigot and socket formations, whereby the spigot formation of one such pipe segment is receivable in a socket formed by the socket formation of another such pipe segment, wherein each slot, across its entire width and depth, opens into the socket at one end of the slot and wherein the pipe segment comprises a first round cylindrical portion extending to one end of the pipe segment and forming the socket, and a second round cylindrical portion integral with and extending from the first cylindrical portion to the other end of the segment, the inside diameter of the first cylindrical portion being equal to or slightly greater that the outside diameter of the second cylindrical portion.