This exhaust extension allows for safe venting of exhaust fumes from an unoccupied enclosed area - this will allow your expensive unit to stay dry and secure while maintaining portability. This adapter is designed for use on stock muffler ports that are less than 15/16 inch (24 mm) diameter, weld bead diameter under 1-3/8 inch (35 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 for this modification. The buyer will receive: a custom low profile exhaust to tubing stub, the specified length of galvanized 1" I.D. indoor/outdoor flexible exhaust tubing and the proper size u-bolt clamp.