The DiversiTech® D40620500B3B6 mini-split line set is designed for air conditioning and refrigeration systems. The suction line is pre-insulated with Armaflex AP pipe insulation. The insulation is a black flexible elastomeric thermal insulation. The expanded closed-cell structure makes it an efficient insulation. DiversiTech mini-split line Sets are similar to standard line sets but come with additional insulation on the liquid line and flared line ends.