WAVIN ITALIA TEGRA 425 - Инспекционная яма и крышка

According to PN-B-10729: 1999 and UNI-EN 476: 2000, TEGRA 425 is defined as a non-accessible inspection chamber with an internal diameter of 425 mm.‎ The chamber is made up of three basic elements: - base, - extension pipes, - covers (concrete support rings, telescopic adapters for manhole covers and cast-iron gullies) The manhole covers and gratings comply with UNI-EN 124:2000.‎ The supporting elements are approved by The Road and Bridge Research Institute (IBDiM) Areas of application - maximum installation depth up to 6m, in the presence of groundwater - areas subject to heavy traffic SLW60 (load class D400), - maximum permissible groundwater level 5m Inspection pit and cover