Elastomeric joint ring: An annular ring used to provide a watertight seal between pipe spigot and socket in a flexibly jointed pipeline.

Flexible joint: A type of joint using an elastomeric joint ring to provide a watertight seal whilst permitting a specified amount of movement between adjacent pipes.

In wall joint: A type of joint where the socket is made within the wall of the pipe, usually referred to as a rebated, ogee or tongue and groove joint.

Ogee Joint: See 'Rebated joint'.

Rebated joint: A joint made within the wall thickness of a unit, including ogee and tongue and groove joints.

Steel banded joints - steel collar: Type of joint where the socket is made within the wall thickness of the pipe by means of an integral steel collar. Used for jacking pipes.

Tongue and groove joint: See 'Rebated joint'.