25 feet 3/8+5/8 ductless split airconders line set is used for mini split air conditioner and suitable for refrigerants R410a. The line set is pre-flared with female nuts for quick connection on each end. The polythene insulation tubes are installed on both copper tubes. Every copper tube of the line set is eddy current tested before installation to make sure no defect. The inside copper tube is cleaned and no grease or impurities.

25 feet 3/8+5/8 ductless split airconders line set contains:
25 feet copper tube 3/8 and 5/8
25 feet 8mm or 9mm thickness polythene foam insulation tube on both copper tubes
Flaring and nuts on both sides of the  airconders line set
Carton packing for each line set

Advantage:
100% pure copper:
Unlike many other line set brands that are made of aluminum, our line sets are 100% pure copper. Aluminum (CU-AL) is cheaper than copper so many brands are starting to produce aluminum line sets to save on cost. However, aluminum cannot be cut or reduced like the industry standard copper lines. And most importantly, aluminum lines will result in a loss of energy efficiency. The Thermal conductivity is much greater in copper than aluminum (around 60%), so the short term savings of aluminum line sets will result in higher utility costs in the long term.

Copper tube conform to ASTM B280 standard, EN 12735-1 standard, AS 1571 standard and JIS H3300 standard
The annealing, chemical composition, mechanical properties, dimension, tolerance conforms to ASTM B280 standard, EN 12735-1 standard, AS 1571 standard and JIS H3300 standard.
Copper tube interior surface cleanness no more than 0.038g/m2
More important, our copper tubes are with CE certificate and ASTM B280 testing cerficate.

Three layer structure white embossed polythene foam insulation tube, UV resistant, fire proof rating UL 94 standard HF-1
Thick three-layer irradiation cross-linked polyethylene (IXPE, low density) foam insulation tubes maximize energy efficiency by minimizing energy transfer. White reflects heat rather than absorbs heat, and white irradiation cross-linked polythene insulation has great resistance to sun exposure and lasts longer than the black rubber insulation. Embossed surface provides for easy handling.
Thermal conductivity is less than 0.037 kcal/m.h.°C, and water absorption less than 0.01g/100cm2
working temperature: -40°C to +120°C

Every line set is pre flared to make easy connection
The line sets come pre-flared with brass flare nuts already installed for easy connection to service ports on the air conditioning system. No soldering!