This line set has a 1/4" liquid line, 1/2" suction line and is 25' long. It can be used with the DIY Multi-Zone 4th Gen Systems in conjunction with the 9,000, 12,000 and 18,000 BYU Indoor Units. It can also be used to extend the line set length included with the 12,000 and 18,000 BTU DIY Single Zone Systems. The line set is encased in a strong, 3/4" UV Protective Insulation Sleeve. It will prevent sun damage, weather erosion and destruction from wildlife. The No-Vac Line Set is kink resistant and easy to bend during installation.