1) Tubes are units that are used to connect different types of radiators, heat exchangers, and other components to each other in a plumbing system.
2) 3BY6 is a type of tube design that features a three inch outside diameter by a six inch length. This type of tube is commonly use in a variety of applications, including but not limited to, water systems, heating and air conditioning equipment, and industrial and commercial systems.
3) This type of tube is usually made from materials such as copper, aluminum, brass, and steel, as well as flexible plastic materials. 3BY6 variants may vary in terms of wall thickness and diameter to suit different piping applications and meet industry standards.