Often times during the installation phase the service technician may need to connect a copper tube (called a line set) to the outdoor unit, but the connections on the unit do not match the copper line set. When this occurs, they will need to employ an adapter when going up in size, or a reducer when going down in size. Here you will find our selection of reducers and adapters that should fit any needs. Service technicians may be interested in our bulk pricing options or setting up an automatic delivery subscription.