Building Materials (ACO System) Manufacturer of stainless steel, drainage system, ductile iron manhole covers and channel gratings. ACO 600 mm Dia Heavy Duty D 400 Class, Manhole Cover Stainless steel floor drains Stainless steel floor drains Stainless steel floor drains Stainless steel floor drains Stainless steel floor drains Roof Drains Balcony Drains ACO 600 x 600 mm Heavy Duty D 400 Class Manhole cover ACO 675 mm Dia Manhole Cover with Hinged Bolted System ACO 675 mm dia Manhole Cover with GRP Sealing Plate ACO Ductile Iron Channel Gratings Installed @ Veterinary Quarantine Buri 3 ACO Ductile Iron Channel Gratings Installed @ Veterinary Quarantine Buri 2 ACO Ductile Iron Channel Gratings Installed @ Veterinary Quarantine Buri 1 Stainless Steel kitchen gully Stainless Steel Kitchen Gratings