Thermal insulation lid, manufactured from polyethylene (PE), incorporates an air cushion. Double-layer wall: the outer layer is made of compact material (mass-colored polyethylene) and the inner layer is expanded polyethylene with expanding agents. Manufactured using rotomolding technology. Reference standard STF 9/2005 Valrom Industrie Company Technical Standard. Use Used for water meter chambers with DN 800mm and DN 1,100mm, together with sealing gasket art. code 47901000116. Technical approval and certification for use in construction.