Home Page VIADUCT FILTERS AC 10 AC 10 EXPLANATION VIADUCT STRAINER CAST IRON,THE GRATE IS MADE OF DUCTILE IRON ALIMINIUM OR BRASS ARE ALSO AVAIBLE UPON DEMAND.PAINT&COLOURS: RUBBER BASED BLACK BUTIM PAINTING, GRATE IS PANTED WITH ELECTROSTATIC PAINT IN VAIOUS COLURS UPON DEMAND.