... price 2.prompt shipment Galvanized Steel Coupling Outer / Male Connector for Joining Spiral Ducts Purpose: HVAC, inlet and outlet ... in vemtilation system.Material: Galvanized Steel , Stainless Steel (With rubber /gasket & No rubber/gasket)Size: Dia.80, 100, 125, 150, 160 ... , vent duct, ship duct, air duct, regulating damper, connector, elbow and many other special pipe fitting. Galvanized Steel Coupling ...