This part attaches to the back of the AC Unit. The connector that fastens the hose to the back of the AC unit connects to this fastener. This part does NOT come with installation instructions. This original Delonghi Air Conditioner AC Exhaust Hose Fastner originally shipped with the following Delonghi devices: PACCN120EEX1 PACAN130HPESWH3A This is a true Delonghi part! This item is NEW! Don t see your model number? Send us a message as we are happy to help!