A 37 degree-flared tee fitting is an excellent pressure fitting having a broad selection of styles & shapes and is very extensively used all over the globe. Main features that call for its use are:

The flared tube fitting is one of the most popular configuration of hydraulic fluid connector in many parts of the world. While the SAE system is often used for joining tubing in a hydraulic system, it is frequently also used on flexible plumbing systems (hose) as an end adapter for female SAE swivels, which is the most common - and affordable - end connection on hydraulic hose assemblies.

A few of the 37 degree flare Tee Tube Fittings: