Durable and Portable: the air exhaust hose is made by polypropylene with good flexible, which is a good replacement when the essential vent hose has cracked Length adjustable: the hose is extendable, shorten to 12.6 inch/ 32 cm, extendable up to 59 inch/ 150 cm, stretch and shrink freely the length of the exhaust hoseUniversal size: hose diameter is 5 inch/ 13 cm, fits to various portable air conditioners using 5" diameter hose Easy to install: gently extend out the exhaust hose to meet up with the existing hose, line up with the both ends, snap into place Warm note: the hose diameter is 5 inch/ 13 cm (outer edge to outer edge);Facing the hose,it is counter clockwise, please check your air conditioner models before purchase to make sure the size is compatible