8-1/2" Pipe Extension 4inch-6inch Direct Vent (black)

Use to add length to a straight length of DirectVent Pro rigid sections of pipe. Designed for appliances tested and listed for direct vent and features a fully unitized twist-lock construction. Use of sealant is optional, unless specified by the appliance manufacturer. To calculate install length, subtract 1 1/2" for each joint. No beads or hems, allowing for a beautiful, sleek finish that looks great in any interior.