The inspection chambers are manufactured from high-quality HDPE and are used as inspection, control and/or siphon chambers for buried sewer pipelines for the non-pressure drainage of rainwater and domestic wastewater. The chambers are BENOR-certified in accordance with NBN EN 13598-1 (chamber diameters from 250 to 400 mm) and NBN EN 13598-2 (chamber diameters from 500 to 1200 mm). The HDPE inspection chambers are suitable for the drainage of water with temperatures that may temporarily reach up to 95°C. The chambers are manufactured from HDPE pipes with diameters Ø250 mm, Ø315 mm, Ø400 mm, Ø500 mm, Ø630 mm, Ø710 mm, Ø800 mm, Ø1000 mm, Ø1200 mm or Ø1500 mm, onto which an HDPE base plate and HDPE pipe connections are welded.