This document specifies the requirements for clay drain and sewer pipes and fittings. It details the materials, dimensions, performance criteria, and testing methods necessary to ensure the quality and suitability of these products for underground drainage systems, including those for surface water.

As a British Standard, this specification is regarded as a definitive technical document within the construction and engineering industries. It provides the authoritative framework for manufacturers and specifiers to ensure the quality and performance of clay drainage products. Its detailed requirements and testing methods are essential for compliance with building regulations and best practices in civil engineering projects.