This 50 ft. mini split line set (Model: KDLJTG50FT14P70GBV0, also linked to JSY-SS-SKU4) from VEVOR is designed to connect the indoor and outdoor units of a mini-split air conditioning system. It features 1/4 in. and 1/2 in. O.D. pure copper pipes for high and low pressure lines respectively. The line set includes a triple-layer insulation, composed of embossed polyethylene film and thickened insulating cotton, to prevent energy loss and condensation. The insulation is white and designed to be weather and UV resistant. It is suitable for most 12000-18000 BTU mini split air conditioners and heat pump systems that require this specific line set configuration. The product includes wrapping strips for installation. Note: the item description advises that sets may be missing pieces or otherwise incomplete