New-Open Box About this item heat preservation cotton and brass Product data: Length: 50 ft, diameter of brass hose: 1/4 inch and 3/8 inch, other accessories are as shown in the figure. Quality material: The air conditioning copper tubing hose extension is made of copper, which has good toughness and hardness, good ductility and longer service life. Thickened insulation cotton: The air conditioning copper tubing hose extension is made of thickened insulation cotton, which better reduces damage to the internal copper tube. Please note that the temperature of the insulation layer should not exceed 80 degrees. Excellent workmanship: Thickened nut has high hardness, no slipping, and is sturdy and durable. Mechanical accurate reaming, no burr, no leakage, more secure to use. Easy installation: The finished product can be installed directly, without welding after hand, and needs 1/4 inch and 3/8 inch settings. Air-conditioned to connect the bedroom, restaurants or office, this insulated copper hose is a good choice.