<p>An apertured pipe segment is disclosed which is of injection moulded plastics construction and can be used to form a well screen or sub-soil drainage pipe. Each aperture comprises a longitudinally extending inner slot 18 which extends from a slot mouth 24 inwardly and is defined by inwardly diverging slot walls 22, and an outer slot 20 which extends from the outside of the pipe segment inwardly to the slot mouth. The smallest width of the outer slot is greater than the width of the slot mouth. The inner slot is open longitudinally to one end of the pipe segment and the outer slot is open longitudinally to the other end of the pipe segment. The pipe segments can thus be made by an inexpensive two-part mould not requiring collapsible cores.</p>
