Round Metal Pipe Reducer & Increaser | 12" to 8" HVAC Duct Reducer or Increaser 26g Gauge | Galvanized Sheet Metal Ducting Connector is Compatible with Duct 8" Sheet Metal Fittings + Product Details Size -

+ Product Details Size - 30"w X 22"h X 2"d (for duct opening measurement only)

But for plumbing it will fit onto a pipe that is 1/4" on the "inside" (ID) which equals to 1/2 on the outside

+ Product Details Size - 16"w X 12"h X 2"d (for duct opening measurement only)

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+ Product Details Size – Stick-on collar is 20" and it is compatible with duct 20"

Round Metal Pipe Reducer & Increaser | 12" to 8" HVAC Duct Reducer or Increaser 26g Gauge | Galvanized Sheet Metal Ducting Connector is Compatible with Duct 8" Sheet Metal Fittings + Product Details Size -+ Product Details Size & Compatibilty The 12" to 8" round metal pipe reducer & increaser 30 gauge is compatible with duct 12" to 8". Made in the USA Premium Quality Our galvanized ducting connector is made of high quality galvanized sheet metal. Applications Reducers transition ducts from larger to smaller sizes and ensure smooth, continuous airflow. + Product Description The HVAC Premium Round Metal Pipe Reducer & Increaser is crafted from high