System for connecting underground pipes comprises disks with circular apertures which fit into peripheral grooves in collars on ends of pipes , disks being held in place by annular clamp

摘要

The system for connecting underground pipes (4, 5) comprises disks (6, 7) with circular apertures which fit into peripheral grooves (13) in collars on the ends of the pipes. The disks are held in place by an annular clamp (8)