MECCANIXITY Straight Copper Coupling Fittings, 3/4 Inch ID Welding Joint for HVAC Air Conditioner, with Rolled Tube Stop Sweat Ends, 0.9mm Thick Pack of 5

What is this?Air conditioning and refrigeration accessories adapter, widely used to connect pipelines, such as HVAC air-conditioning devices, refrigeration or hydraulic applications, etc.What will I get?Package Content: 5pcs x Copper Coupling Fitting; Inner Diameter: 3/4"(19mm / 0.75 inch); Length: 28mm / 1.1 inch; Thickness: 0.9mmAre there any advantages of the product?Made of copper with good toughness, easy to weld, stable performance and long service life. Light external surface, accurate size. With rolled tube stop and sweat ends, easy to joint.How to use it?Replace the old coupling fitting, easy installation.What should I notice?Please confirm the inner diameter before ordering.