| Brand | Master Flow |
| Material | Galvanized Steel |
| MPN | R4X3 |
| Compatible Brand | Master Flow |
| UPC | 050206925508 |
Master Flow R4X3 4 in. Round Reducer. Always insulate ductwork for greater system efficiency and comfort (insulation not included). The Master Flow 4 in. Round Reducer is made of galvanized steel. pipe to a 3 in.