10 in. x 3-1/4 in. to 4 in. Stack Boot Sku: MAS-SB10X3.25X4-HD This is a brand new part comes with a full manufacturer warranty!!! This sale transaction is for only this part number: SB10X3.25X4 This Master Flow 10 in. x 3-1/4 in. to 4 in. Stack Boot can be used to create a transition between different pipes and ducts. It's made of galvanized steel and can be installed with sheet-metal screws. Features: Galvanized-steel construction Creates an in-line transition between a round pipe or insulated-flexible duct to a rectangular stack or riser duct Installs with sheet-metal screws Insulate ductwork for system efficiency and comfort Seal seams with code-approved mastic, sealant or duct tape (not included) TERMS OF SALE: If, after receiving this item you discover that it was not the one you wanted, simply return it for a full refund within 30 days. You will have to pay for the return shipping charges. Refund is void if you have installed, used or damaged the item in any way. Item must be returned with its original box, packing materials and instructions. Payment via PayPal must be received within 3 days of transaction and prior to shipping. SHIPPING: Shipping charge will be based upon location. Please use the shipping calculator or request a shipping quote. International buyers: Customs fees, duties, taxes, tariffs other fees are your responsibility. Arrival time will depend on your location. If you have any questions, feel free to ask. Thank you for visiting! Weight:7.0000~SCID:175803~Dimension:8.000x12.000X6.000