About this item Heat Preservation Cotton and Brass Product data: Length: 50 feet, diameter of copper hose: 1/2 inch and 1/4 inch respectively, material : heat preservation cotton and brass, without other accessories. Durable material: The air conditioning copper tubing hose extension is made of copper, which has good toughness, hardness, ductility, extended service life, and brings more comfortable experience for your air conditioning. Thickened insulating cotton: The air conditioning copper tubing hose extension is made of thickened insulating cotton, which is effective in heat insulation. The details are in place: The thickened nut has high hardness, does not slip, and is durable. Mechanical accuracy reaming, without burr and leakage. Easy to install: The finished product can be installed directly without manual welding. There are many models and lengths to choose from. The air conditioner can be connected to the bedroom, restaurant or office. › See more product details