This AN816-16-12 adapter is a must-have for anyone looking to connect pipes to tubes in a safe and efficient manner. Made from high-quality steel with a 1.3125-12 UNJ to 3/4-14 threading, this adapter ensures a secure fit and reliable connection. Designed for use in aviation and other industries, this straight adapter is easy to install and use. With its precise threading and durable construction, it is perfect for connecting pipes to tubes in a variety of applications. Whether you are a professional mechanic or a DIY enthusiast, this adapter is sure to meet your needs.