Describes distribution and service pipes of external diameter from 16 mm to 50 mm, and three classes of watermain pipes, Classes B, C, and D, suitable for use at nominal working pressures of 200, 300 and 400 feet head of water respectively and ranging in external diameter from 63 mm to 400 mm for Class B and C pipes and 63 mm to 200 mm for Class D pipes. Also includes requirements for composition, dimensions and tolerances and a comprehensive range of tests.