Ogee

A joint with an elongated “S” profile within the thickness of a sewer pipe wall.

Oiler

Changes amount of lubricating oil injected in supply air.

One-Pass

A procedure by which the carrier pipe is directly jacked into the ground.

OPC

Ordinary Portland Cement; customarily used for making concrete, mortar and grout in non-aggressive conditions.

Open Cut

The method by which access is gained to the required level underground for the installation, maintenance or inspection of a pipe, conduit or cable. The excavation is then backfilled and the surface restored. See Conventional Trenching.