6" AC Hose Coupler The ideal tool for extending your hose Our air conditioner exhaust hose connector lets you extend the length of your air conditioner hose. AC couplers allow easy connection of exhaust hoses and portable air conditioners to window or wall outlets. 6" exhaust hose duct extenders are constructed from ABS and PLA plastics, offering superior durability. A portable AC exhaust hose extension connector's durable structure and flexibility ensures its durability against wear and tear.