HDIUK 3m Portable Air conditioner Exhaust duct hose extension kit, Increase the length of your existing flexible hose Easily extend the length of your existing AC Unit exhaust duct Now you can use the AC unit where you need it. Extension hose supplied is flexible and strong and heat resistant upto 158 degrees F Provides an extension to the existing hose. Designed with a wider diameter to accomodate the faster flow of air needed over the extended length Easy to attach to existing hose with supplied duct tape and reduction ring adaptor Your existing hose should be at least 5 inches in diameter Specially manufactured. High quality PVC Ducting with metal reinforcment. Specially designed to be Light and Flexible but Strong.