GenExhaust Universal Generator exhaust extension allows for safe venting of exhaust fumes from an unoccupied enclosed area. This adapter is designed for use on stock muffler ports that are less than 15/16 inch (24 mm) diameter, weld bead diameter under 1 inch (25-1/2 mm) and length of less than 1 inch (25-1/2 mm) long. See pictures for further explanation. All dimensions are with the spark arrester removed. The spark arrester will have to permanently removed/relocated for this modification. The buyer will receive: a custom low profile 3/4" NPT (Nation Pipe Taper) steel exhaust stub and quick disconnect fittings.