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

DCS-BG100BLAST GATE WITH 100MM DIAMETER

DCS-BG125BLAST GATE WITH 125MM DIAMETER

DCS-BG150BLAST GATE WITH 150MM DIAMETER

DCS-BG180BLAST GATE WITH 180MM DIAMETER

DCS-BG200BLAST GATE WITH 200MM DIAMETER