Your climate control system's copper tubing is a critical component, often overlooked, that carries refrigerant between the interior appliance and the exterior unit. Understanding its makeup – including the sizes, https://www.plumbingsupplyandmore.com/3-8-x5-8-x1-2-x25-black-plain-end-lineset-mini-split-duraguard-insulated-both-lines-2003438.html