Natural colored polyethylene for general use, but particularly suitable for installation in raised floors, 2 cleaning holes Ø 120 mm, 1 inlet spigot Ø 40 mm, 1 outlet spigot Ø 40 mm, 6 ventilation connections Ø 19 mm, each opened as required , 2 pieces of mounting preparation for measuring probes Ø 60 mm, 4 integrated mounting feet, upper side ribbed for reinforcement, lower side equipped with a partition