Natural color polyethylene for general use, but especially suitable for installation in false floors, 2 pieces of cleaning holes Ø 120 mm, 1 piece of inlet connection Ø 40 mm, 1 piece of outlet connection Ø 40 mm, 6 pieces of vent connection Ø 19 mm, each to be opened if necessary, 2 pieces of mounting preparation for measuring probes Ø 60 mm, 4 integrated mounting feet, top side ribbed for stiffening, bottom side fitted with baffle.