This shallow access chamber base (also known as a PPIC) is underground and has a 315mm diameter. It is appropriate for drainage schemes with a 110mm pipe diameter. This chamber has a 110mm main channel, two 110mm side inlets that are 90 degrees from the main channel, and two additional 110mm inlets that are 45 degrees from the main channel. The chamber may be inverted to a maximum depth of 600mm (0.6m).