Branch connections are well-known as olets. In this video, the different types of olets are explained. Olets can be fabricated on-site or added after the fact to reinforce connections. The most common branch connections are weldolets, sockolets, thredolets, elbolets, and nipolets. Specialized branch connections include couplets, latrolets, and flexolets.
Weldolets are used for butt welding and are the most popular olet. Sockolets are designed for use with socket welding. Thredolets are designed to be used in threaded joints. Elbolets are multi-use olets that can be used in butt welding, socket welding, and in threaded joints. Nipolets are similar to elbolets, but are connected to a small pipe. Like elbolets, nipolets are multi-purpose tools. Latrolets are used in special degree situations. Like elbolets and nipolets, latrolets are able to be used in a variety of positions. Couplets have female ends and are designed specifically for low-pressure services.
Know that you have a better understanding of olets, you can choose the right tools for your next job.