Socket and Spigot Flexible Joints are assembled with synthetic rubber gaskets of special shape - the gasket has a hard ‘Heel’ and a soft ‘Bulb’.
For overground applications and for fixing appurtenances, flat faced flange joint fittings are used.
Restrained Joints eliminate the use of concrete anchor blocks. These special joints are made with Bolts and Glands to provide axial restraint.
This is a special Restrained Joint system (known as Electrolock Joint) which does not use bolts for restraining.
This is a self-restraining joint where thrust restraint is achieved by a specially designed gasket with embedded steel teeth. This performs the dual role of water sealing and restraining.
Express type mechanical joint is a bolted flexible joint used in DI fittings. The sealing is obtained by applying pressure to the gasket by a separate gland. The gland, when bolted with the pipe, exerts pressure on the sealing rubber gasket and makes the joint leak-proof.