API tubing and casing pup joints are short sections of tubing or casing that are used to connect two longer sections together. They are typically used in oil and gas drilling operations to extend the length of the tubing or casing string. The term "pup joint" refers to the fact that these sections are shorter than the standard lengths of tubing or casing. They are typically available in lengths of 2, 4, 6, 8, 10, or 12 feet, although custom lengths can also be manufactured. API tubing and casing pup joints are manufactured to meet the specifications of the American Petroleum Institute (API). This ensures that they are made from high-quality materials and have undergone rigorous testing to ensure their strength and durability. These pup joints are threaded on both ends, allowing them to be easily connected to other sections of tubing or casing using coupling connections. They are available in various sizes and grades to accommodate different drilling conditions and operating pressures. API tubing and casing pup joints are essential components in the oil and gas industry, as they provide a flexible and convenient way to connect and extend tubing or casing strings. They are used in a variety of applications, including drilling, completion, and production operations.