This inspection chamber base has a diameter of 600mm and features a main twinwall channel of 315mm, an additional two 225mm inlets at 90 degrees.Our inspection chambers allow access to drain and sewer systems for testing, inspection, maintenance and cleaning. These actions can be performed from the surface and should not require entrance into the chamber itself.KEY FEATURES andamp; BENEFITS OF THIS PRODUCTQuick and simple installationArrives factory assembled in one pieceDesign life of 60 yearsLightweight and requires no specialist equipment to liftCompatible with most UK twinwall pipe systemsGranular backfillComplies with EN 13598-2 (2009), SfA7 and Building Regulations Part H12 x 315mm twinwall inlets2 x 225mm twinwall inletsTo view Turtleand#039;s installation guide for twinwall inspection chambers,andnbsp;click here.