How Is Drainage Pipe Measured?

Drainage pipe is measured externally. 110mm is the external diameter of our 110mm underground drainage pipe. Our drainage pipe is also available with an integral socket on one end, the dimensions of this socket are shown below on the right.

D043 Plain Ended

Plain Socket Drainage Pipe

D143 Socket One End

Socket One End Drainage Pipe

We also stock the 160mm Drainage system if your installation requires larger capacity underground drainage.

What size is drain pipe?

In the UK the most common size of PVC underground drainage pipe for domestic housing is 110mm. (This refers to the outside diameter of the pipe). When a number of houses are joined to the same drainage system, 160mm pipe is generally used for the pipe carrying the main flow.

Above ground PVC drainage pipe (known as soil pipe) is also 110mm, enabling it to be connected to the underground drainage system without the need for special adaptors.

Items you will need