The threaded branch connection (also known as a threadolet or TOL) is another type of olet, however the branch affixes to the TOL by way of a thread just inside the top of the olet. The bore matches the outlet bore, and the existence of this threading facilitates installation, as no welding is necessary. The TOL is considered a threaded fitting. These flanges are available in all of our stainless steel and chrome-moly grades, from ½” to 24” and beyond, class 150 to 2500.