These manually-operated blast gates are made by steel, stronger than plastic.

DCS-BG100 BLAST GATE WITH 100MM DIAMETER

DCS-BG125 BLAST GATE WITH 125MM DIAMETER

DCS-BG150 BLAST GATE WITH 150MM DIAMETER

DCS-BG180 BLAST GATE WITH 180MM DIAMETER

DCS-BG200 BLAST GATE WITH 200MM DIAMETER