8 Inch to 4 Inch Duct Reducer Increaser Galvanized Steel Air Duct Adapter Round Crimped Pipe Connector Fitting Coupling for HVAC Ventilation Systems Wedding Favor Bags *The chisel made of 45

*The chisel made of 45 carbon steel and its optimal shape for ensure high performance and durability

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8 Inch to 4 Inch Duct Reducer Increaser Galvanized Steel Air Duct Adapter Round Crimped Pipe Connector Fitting Coupling for HVAC Ventilation Systems Wedding Favor Bags *The chisel made of 45Size Details: the 8 inch to 4 inch duct reducer measures about 5. 9 inches 15 cm in length, 0. 02 inch 0. 6 mm in thickness, ideal for connecting 8 inches and 4 inches duct systems to get a smooth transition; Please check the specification and size of the product before purchase Tapered Design: the 8 inch to 4 inch pipe reducer increaser features a precision tapered design, to reduce air flow turbulence and reduce pressure loss, which suitable for