Osma UltraRib joints are made be placing the sealing ring between the second and third external reinforcing ribs nearest the spigot end of the pipe, which is then inserted into a socket
No need to chamfer pipe when jointing & ring displacement is impossible during installation
SN8 stiffness class
BS EN 13476-3, WIS 4-35-01, BBA approved
Available in 150-300mm diameters, UltraRib can be used up to a depth of 10m